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Frentiu FD, Belvis AFV, Dupont-Rouzeyrol M, Edillo FE, Harishchandra J, Mariasua J, Nguyen TTT, O'Connor O, Santoso MS, Tran NTH, Yudhaputri FA. Arbovirus research in the Asia-Pacific needs more women in leadership. Lancet Infect Dis 2024; 24:231-232. [PMID: 38237615 DOI: 10.1016/s1473-3099(23)00817-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 12/19/2023] [Indexed: 02/25/2024]
Affiliation(s)
- Francesca D Frentiu
- School of Biomedical Sciences, Centre for Immunology and Infection Control, Queensland University of Technology, Brisbane, QLD 4001, Australia.
| | | | - Myrielle Dupont-Rouzeyrol
- Unité de Recherche et d'Expertise Dengue et Arboviroses, Institut Pasteur de Nouvelle-Calédonie, Noumea, New Caledonia
| | - Frances E Edillo
- Mosquito Research Laboratory, Biology Department, University of San Carlos Talamban Campus, Cebu City, Philippines
| | | | - Joanne Mariasua
- Department of Public Health, Ministry of Health, Port Vila, Vanuatu
| | - Thuy T T Nguyen
- Department of Virology, National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
| | - Olivia O'Connor
- Unité de Recherche et d'Expertise Dengue et Arboviroses, Institut Pasteur de Nouvelle-Calédonie, Noumea, New Caledonia
| | | | - Ninh T H Tran
- National Hospital for Tropical Diseases, Hanoi, Vietnam
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Ciocchetta S, Frentiu FD, Montarsi F, Capelli G, Devine GJ. Investigation on key aspects of mating biology in the mosquito Aedes koreicus. Med Vet Entomol 2023; 37:826-833. [PMID: 37622600 DOI: 10.1111/mve.12687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 07/27/2023] [Indexed: 08/26/2023]
Abstract
Aedes koreicus Edwards, 1917 (Hulecoetomyia koreica) is a mosquito (Diptera: Culicidae) from Northeast Asia with a rapidly expanding presence outside its original native range. Over the years, the species has been discovered in several new countries, either spreading after first introduction or remaining localised to limited areas. Notably, recent studies have demonstrated the ability of the species to transmit zoonotic parasites and viruses both in the field and in laboratory settings. Combined with its invasive potential, the possible role of Ae. koreicus in pathogen transmission highlights the public health risks resulting from its invasion. In this study, we used a recently established population from Italy to investigate aspects of biology that influence reproductive success in Ae. koreicus: autogeny, mating behaviour, mating disruption by the sympatric invasive species Aedes albopictus Skuse, 1894, and the presence of the endosymbiont Wolbachia pipientis Hertig, 1936. Our laboratory population did not exhibit autogenic behaviour and required a bloodmeal to complete its ovarian cycle. When we exposed Ae. koreicus females to males of Ae. albopictus, we observed repeated attempts at insemination and an aggressive, disruptive mating behaviour initiated by male Ae. albopictus. Despite this, no sperm was identified in Ae. koreicus spermathecae. Wolbachia, an endosymbiotic bacterium capable of influencing mosquito reproductive behaviour, was not detected in this Ae. koreicus population and, therefore, had no effect on Ae. koreicus reproduction.
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Affiliation(s)
- Silvia Ciocchetta
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Francesca D Frentiu
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
- Centre for Immunology and Infection Control, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Fabrizio Montarsi
- Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Padua, Italy
| | - Gioia Capelli
- Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Padua, Italy
| | - Gregor J Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
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3
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Delrieu M, Martinet JP, O’Connor O, Viennet E, Menkes C, Burtet-Sarramegna V, Frentiu FD, Dupont-Rouzeyrol M. Temperature and transmission of chikungunya, dengue, and Zika viruses: A systematic review of experimental studies on Aedes aegypti and Aedes albopictus. Curr Res Parasitol Vector Borne Dis 2023; 4:100139. [PMID: 37719233 PMCID: PMC10500480 DOI: 10.1016/j.crpvbd.2023.100139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/11/2023] [Accepted: 08/16/2023] [Indexed: 09/19/2023]
Abstract
Mosquito-borne viruses are leading causes of morbidity and mortality in many parts of the world. In recent years, modelling studies have shown that climate change strongly influences vector-borne disease transmission, particularly rising temperatures. As a result, the risk of epidemics has increased, posing a significant public health risk. This review aims to summarize all published laboratory experimental studies carried out over the years to determine the impact of temperature on the transmission of arboviruses by the mosquito vector. Given their high public health importance, we focus on dengue, chikungunya, and Zika viruses, which are transmitted by the mosquitoes Aedes aegypti and Aedes albopictus. Following PRISMA guidelines, 34 papers were included in this systematic review. Most studies found that increasing temperatures result in higher rates of infection, dissemination, and transmission of these viruses in mosquitoes, although several studies had differing findings. Overall, the studies reviewed here suggest that rising temperatures due to climate change would alter the vector competence of mosquitoes to increase epidemic risk, but that some critical research gaps remain.
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Affiliation(s)
- Méryl Delrieu
- Institut Pasteur de Nouvelle-Calédonie, Institut Pasteur International
Network, URE Dengue et Arborises, Nouméa 98845, New Caledonia
| | - Jean-Philippe Martinet
- Institut Pasteur de Nouvelle-Calédonie, Institut Pasteur International
Network, URE Dengue et Arborises, Nouméa 98845, New Caledonia
| | - Olivia O’Connor
- Institut Pasteur de Nouvelle-Calédonie, Institut Pasteur International
Network, URE Dengue et Arborises, Nouméa 98845, New Caledonia
| | - Elvina Viennet
- School of Biomedical Sciences, Queensland University of Technology,
Kelvin Grove, QLD 4059, Australia
| | - Christophe Menkes
- ENTROPIE, IRD, University of New Caledonia, University of La Réunion,
CNRS, Ifremer, Nouméa, New Caledonia
| | - Valérie Burtet-Sarramegna
- Institute of Exact and Applied Sciences (ISEA), University of New
Caledonia, 45 Avenue James Cook - BP R4 98 851 - Nouméa Cedex, New
Caledonia
| | - Francesca D. Frentiu
- School of Biomedical Sciences, And Centre for Immunology and Infection
Control, Queensland University of Technology, Brisbane, QLD 4000,
Australia
| | - Myrielle Dupont-Rouzeyrol
- Institut Pasteur de Nouvelle-Calédonie, Institut Pasteur International
Network, URE Dengue et Arborises, Nouméa 98845, New Caledonia
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4
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Frentiu FD. Dengue fever: the impact of increasing temperatures and heatwaves. EBioMedicine 2023; 92:104611. [PMID: 37182266 PMCID: PMC10200830 DOI: 10.1016/j.ebiom.2023.104611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 04/26/2023] [Indexed: 05/16/2023] Open
Affiliation(s)
- Francesca D Frentiu
- School of Biomedical Sciences and Centre for Immunology and Infection Control, Queensland University of Technology, Brisbane, 4000, Australia.
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Novelo M, Dutra HLC, Metz HC, Jones MJ, Sigle LT, Frentiu FD, Allen SL, Chenoweth SF, McGraw EA. Dengue and chikungunya virus loads in the mosquito Aedes aegypti are determined by distinct genetic architectures. PLoS Pathog 2023; 19:e1011307. [PMID: 37043515 PMCID: PMC10124881 DOI: 10.1371/journal.ppat.1011307] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 04/24/2023] [Accepted: 03/19/2023] [Indexed: 04/13/2023] Open
Abstract
Aedes aegypti is the primary vector of the arboviruses dengue (DENV) and chikungunya (CHIKV). These viruses exhibit key differences in their vector interactions, the latter moving more quicky through the mosquito and triggering fewer standard antiviral pathways. As the global footprint of CHIKV continues to expand, we seek to better understand the mosquito's natural response to CHIKV-both to compare it to DENV:vector coevolutionary history and to identify potential targets in the mosquito for genetic modification. We used a modified full-sibling design to estimate the contribution of mosquito genetic variation to viral loads of both DENV and CHIKV. Heritabilities were significant, but higher for DENV (40%) than CHIKV (18%). Interestingly, there was no genetic correlation between DENV and CHIKV loads between siblings. These data suggest Ae. aegypti mosquitoes respond to the two viruses using distinct genetic mechanisms. We also examined genome-wide patterns of gene expression between High and Low CHIKV families representing the phenotypic extremes of viral load. Using RNAseq, we identified only two loci that consistently differentiated High and Low families: a long non-coding RNA that has been identified in mosquito screens post-infection and a distant member of a family of Salivary Gland Specific (SGS) genes. Interestingly, the latter gene is also associated with horizontal gene transfer between mosquitoes and the endosymbiotic bacterium Wolbachia. This work is the first to link the SGS gene to a mosquito phenotype. Understanding the molecular details of how this gene contributes to viral control in mosquitoes may, therefore, also shed light on its role in Wolbachia.
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Affiliation(s)
- Mario Novelo
- Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Center for Infectious Disease Dynamics, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Heverton LC Dutra
- Center for Infectious Disease Dynamics, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Department of Biology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Hillery C. Metz
- Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Center for Infectious Disease Dynamics, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Matthew J. Jones
- Center for Infectious Disease Dynamics, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Department of Biology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Leah T. Sigle
- Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Center for Infectious Disease Dynamics, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Francesca D. Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Herston, Queensland, Australia
| | - Scott L. Allen
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
| | - Stephen F. Chenoweth
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
| | - Elizabeth A. McGraw
- Center for Infectious Disease Dynamics, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Department of Biology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
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Wimalasiri-Yapa BMCR, Huang B, Ross PA, Hoffmann AA, Ritchie SA, Frentiu FD, Warrilow D, van den Hurk AF. Differences in gene expression in field populations of Wolbachia-infected Aedes aegypti mosquitoes with varying release histories in northern Australia. PLoS Negl Trop Dis 2023; 17:e0011222. [PMID: 36989319 PMCID: PMC10085034 DOI: 10.1371/journal.pntd.0011222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 04/10/2023] [Accepted: 03/07/2023] [Indexed: 03/30/2023] Open
Abstract
Aedes aegypti is the principal mosquito vector of dengue, yellow fever, Zika and chikungunya viruses. The wMel strain of the endosymbiotic bacteria Wolbachia pipientis was introduced into the vector as a novel biocontrol strategy to stop transmission of these viruses. Mosquitoes with Wolbachia have been released in the field in Northern Queensland, Australia since 2011, at various locations and over several years, with populations remaining stably infected. Wolbachia infection is known to alter gene expression in its mosquito host, but whether (and how) this changes over the long-term in the context of field releases remains unknown. We sampled mosquitoes from Wolbachia-infected populations with three different release histories along a time gradient and performed RNA-seq to investigate gene expression changes in the insect host. We observed a significant impact on gene expression in Wolbachia-infected mosquitoes versus uninfected controls. Fewer genes had significantly upregulated expression in mosquitoes from the older releases (512 and 486 from the 2011 and 2013/14 release years, respectively) versus the more recent releases (1154 from the 2017 release year). Nonetheless, a fundamental signature of Wolbachia infection on host gene expression was observed across all releases, comprising upregulation of immunity (e.g. leucine-rich repeats, CLIPs) and metabolism (e.g. lipid metabolism, iron transport) genes. There was limited downregulation of gene expression in mosquitoes from the older releases (84 and 71 genes from the 2011 and 2013/14 release years, respectively), but significantly more in the most recent release (509 from the 2017 release year). Our findings indicate that at > 8 years post-introgression into field populations, Wolbachia continues to profoundly impact expression of host genes, such as those involved in insect immune response and metabolism. If Wolbachia-mediated virus blocking is underpinned by these differential gene expression changes, our results suggest it may remain stable long-term.
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Affiliation(s)
- B M C Randika Wimalasiri-Yapa
- Department of Medical Laboratory Sciences, Faculty of Health Sciences, Open University of Sri Lanka, Nugegoda, Colombo, Sri Lanka
- School of Biomedical Sciences and Centre for Immunology and Infection Control, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Bixing Huang
- Public Health Virology, Forensic and Scientific Services, Department of Health, Queensland Government, Coopers Plains, Queensland, Australia
| | - Perran A Ross
- Pest and Environmental Adaptation Research Group, School of BioSciences, Bio21 Institute, The University of Melbourne, Melbourne, Victoria, Australia
| | - Ary A Hoffmann
- Pest and Environmental Adaptation Research Group, School of BioSciences, Bio21 Institute, The University of Melbourne, Melbourne, Victoria, Australia
| | - Scott A Ritchie
- Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - Francesca D Frentiu
- School of Biomedical Sciences and Centre for Immunology and Infection Control, Queensland University of Technology, Brisbane, Queensland, Australia
| | - David Warrilow
- Public Health Virology, Forensic and Scientific Services, Department of Health, Queensland Government, Coopers Plains, Queensland, Australia
| | - Andrew F van den Hurk
- Public Health Virology, Forensic and Scientific Services, Department of Health, Queensland Government, Coopers Plains, Queensland, Australia
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Yakob L, Hu W, Frentiu FD, Gyawali N, Hugo LE, Johnson B, Lau C, Furuya-Kanamori L, Magalhaes RS, Devine G. Japanese Encephalitis Emergence in Australia: The Potential Population at Risk. Clin Infect Dis 2023; 76:335-337. [PMID: 36184991 DOI: 10.1093/cid/ciac794] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 09/02/2022] [Accepted: 09/28/2022] [Indexed: 01/18/2023] Open
Abstract
In Australia, Japanese encephalitis virus circulated in tropical north Queensland between 1995 and 2005. In 2022, a dramatic range expansion across the southern states has resulted in 30 confirmed human cases and 6 deaths. We discuss the outbreak drivers and estimate the potential size of the human population at risk.
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Affiliation(s)
- Laith Yakob
- Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Wenbiao Hu
- Faculty of Health, School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Francesca D Frentiu
- Faculty of Health, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Narayan Gyawali
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Leon E Hugo
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Brian Johnson
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Colleen Lau
- School of Public Health, University of Queensland, Brisbane, Australia
| | | | - Ricardo Soares Magalhaes
- Queensland Alliance for One Health Sciences, School of Veterinary Sciences, University of Queensland, Brisbane, Australia
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
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8
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Lu X, Bambrick H, Frentiu FD, Huang X, Davis C, Li Z, Yang W, Devine GJ, Hu W. Species-specific climate Suitable Conditions Index and dengue transmission in Guangdong, China. Parasit Vectors 2022; 15:342. [PMID: 36167577 PMCID: PMC9516795 DOI: 10.1186/s13071-022-05453-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 08/26/2022] [Indexed: 12/02/2022] Open
Abstract
Background Optimal climatic conditions for dengue vector mosquito species may play a significant role in dengue transmission. We previously developed a species-specific Suitable Conditions Index (SCI) for Aedes aegypti and Aedes albopictus, respectively. These SCIs rank geographic locations based on their climatic suitability for each of these two dengue vector species and theoretically define parameters for transmission probability. The aim of the study presented here was to use these SCIs together with socio-environmental factors to predict dengue outbreaks in the real world. Methods A negative binomial regression model was used to assess the relationship between vector species-specific SCI and autochthonous dengue cases after accounting for potential confounders in Guangdong, China. The potential interactive effect between the SCI for Ae. albopictus and the SCI for Ae. aegypti on dengue transmission was assessed. Results The SCI for Ae. aegypti was found to be positively associated with autochthonous dengue transmission (incidence rate ratio: 1.06, 95% confidence interval: 1.03, 1.09). A significant interaction effect between the SCI of Ae. albopictus and the SCI of Ae. aegypti was found, with the SCI of Ae. albopictus significantly reducing the effect of the SCI of Ae. aegypti on autochthonous dengue cases. The difference in SCIs had a positive effect on autochthonous dengue cases. Conclusions Our results suggest that dengue fever is more transmittable in regions with warmer weather conditions (high SCI for Ae. aegypti). The SCI of Ae. aegypti would be a useful index to predict dengue transmission in Guangdong, China, even in dengue epidemic regions with Ae. albopictus present. The results also support the benefit of the SCI for evaluating dengue outbreak risk in terms of vector sympatry and interactions in the absence of entomology data in future research. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-022-05453-x.
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Affiliation(s)
- Xinting Lu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia.,National Centre for Epidemiology and Population Health, The Australian National University, Canberra ACT, Australia
| | - Francesca D Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Xiaodong Huang
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Callan Davis
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Zhongjie Li
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Centre for Disease Control and Prevention, Beijing, China
| | - Weizhong Yang
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Centre for Disease Control and Prevention, Beijing, China.,School of Population Medicine & Public Health, Chinese Academy of Medical Science, Peking Union Medical College, Beijing, China
| | - Gregor J Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia.
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Murphy AK, Salazar FV, Bonsato R, Uy G, Ebol AP, Boholst RP, Davis C, Frentiu FD, Bambrick H, Devine GJ, Hu W. Climate variability and Aedes vector indices in the southern Philippines: An empirical analysis. PLoS Negl Trop Dis 2022; 16:e0010478. [PMID: 35700164 PMCID: PMC9197058 DOI: 10.1371/journal.pntd.0010478] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 05/09/2022] [Indexed: 11/18/2022] Open
Abstract
Background
Vector surveillance is an essential public health tool to aid in the prediction and prevention of mosquito borne diseases. This study compared spatial and temporal trends of vector surveillance indices for Aedes vectors in the southern Philippines, and assessed potential links between vector indices and climate factors.
Methods
We analysed routinely collected larval and pupal surveillance data from residential areas of 14 cities and 51 municipalities during 2013–2018 (House, Container, Breteau and Pupal Indices), and used linear regression to explore potential relationships between vector indices and climate variables (minimum temperature, maximum temperature and precipitation).
Results
We found substantial spatial and temporal variation in monthly Aedes vector indices between cities during the study period, and no seasonal trend apparent. The House (HI), Container (CI) and Breteau (BI) Indices remained at comparable levels across most surveys (mean HI = 15, mean CI = 16, mean BI = 24), while the Pupal Productivity Index (PPI) was relatively lower in most months (usually below 5) except for two main peak periods (mean = 49 overall). A small proportion of locations recorded high values across all entomological indices in multiple surveys. Each of the vector indices were significantly correlated with one or more climate variables when matched to data from the same month or the previous 1 or 2 months, although the effect sizes were small. Significant associations were identified between minimum temperature and HI, CI and BI in the same month (R2 = 0.038, p = 0.007; R2 = 0.029, p = 0.018; and R2 = 0.034, p = 0.011, respectively), maximum temperature and PPI with a 2-month lag (R2 = 0.031, p = 0.032), and precipitation and HI in the same month (R2 = 0.023, p = 0.04).
Conclusions
Our findings indicated that larval and pupal surveillance indices were highly variable, were regularly above the threshold for triggering vector control responses, and that vector indices based on household surveys were weakly yet significantly correlated with city-level climate variables. We suggest that more detailed spatial and temporal analyses of entomological, climate, socio-environmental and Aedes-borne disease incidence data are necessary to ascertain the most effective use of entomological indices in guiding vector control responses, and reduction of human disease risk.
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Affiliation(s)
- Amanda K. Murphy
- School of Public Health and Social Work, Faculty of Health, Queensland University of Technology, Brisbane Australia
- Mosquito Control Laboratory, Department of Population Health, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Ferdinand V. Salazar
- Department of Medical Entomology, Research Institute for Tropical Medicine (RITM), Manila, The Philippines
| | - Ryan Bonsato
- Department of Medical Entomology, Research Institute for Tropical Medicine (RITM), Manila, The Philippines
| | - Gemma Uy
- Department of Health, Center for Health Development 10, Northern Mindanao, Cagaya de Oro, The Philippines
| | - Antonietta P. Ebol
- Department of Health, Center for Health Development 11, Davao City, Davao del Sur, The Philippines
| | - Royfrextopher P. Boholst
- Department of Health, Center for Health Development Soccskargen Region, Cotabato City, The Philippines
| | - Callan Davis
- School of Public Health and Social Work, Faculty of Health, Queensland University of Technology, Brisbane Australia
| | - Francesca D. Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Faculty of Health, Queensland University of Technology, Brisbane Australia
| | - Gregor J. Devine
- Mosquito Control Laboratory, Department of Population Health, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Faculty of Health, Queensland University of Technology, Brisbane Australia
- * E-mail:
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10
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Rusuwa BB, Chung H, Allen SL, Frentiu FD, Chenoweth SF. Natural variation at a single gene generates sexual antagonism across fitness components in Drosophila. Curr Biol 2022; 32:3161-3169.e7. [PMID: 35700732 DOI: 10.1016/j.cub.2022.05.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 04/19/2022] [Accepted: 05/13/2022] [Indexed: 12/30/2022]
Abstract
Mutations with conflicting fitness effects in males and females accumulate in sexual populations, reducing their adaptive capacity.1,2 Although quantitative genetic studies indicate that sexually antagonistic polymorphisms are common,3-5 their molecular basis and population genetic properties remain poorly understood.6,7 Here, we show in fruit flies how natural variation at a single gene generates sexual antagonism through phenotypic effects on cuticular hydrocarbon (CHC) traits that function as both mate signals and protectors against abiotic stress8 across a latitudinal gradient. Tropical populations of Drosophila serrata have polymorphic CHCs producing sexual antagonism through opposing but sex-limited effects on these two fitness-related functions. We dissected this polymorphism to a single fatty-acyl CoA reductase gene, DsFAR2-B, that is expressed in oenocyte cells where CHCs are synthesized. RNAi-mediated disruption of the DsFAR2-B ortholog in D. melanogaster oenocytes affected CHCs in a similar way to that seen in D. serrata. Population genomic analysis revealed that balancing selection likely operates at the DsFAR2-B locus in the wild. Our study provides insights into the genetic basis of sexual antagonism in nature and connects sexually varying antagonistic selection on phenotypes with balancing selection on genotypes that maintains molecular variation.
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Affiliation(s)
- Bosco B Rusuwa
- School of Biological Sciences, The University of Queensland, St Lucia, Australia; Department of Biological Sciences, Chancellor College, University of Malawi, Zomba, Malawi
| | - Henry Chung
- Department of Entomology and Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, MI, USA
| | - Scott L Allen
- School of Biological Sciences, The University of Queensland, St Lucia, Australia
| | - Francesca D Frentiu
- School of Biological Sciences, The University of Queensland, St Lucia, Australia; School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Stephen F Chenoweth
- School of Biological Sciences, The University of Queensland, St Lucia, Australia.
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Stica CJ, Barrero RA, Murray RZ, Devine GJ, Phillips MJ, Frentiu FD. Global Evolutionary History and Dynamics of Dengue Viruses Inferred from Whole Genome Sequences. Viruses 2022; 14:v14040703. [PMID: 35458433 PMCID: PMC9030598 DOI: 10.3390/v14040703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 03/18/2022] [Accepted: 03/25/2022] [Indexed: 12/20/2022] Open
Abstract
Dengue is an arboviral disease caused by dengue virus (DENV), leading to approximately 25,000 deaths/year and with over 40% of the world’s population at risk. Increased international travel and trade, poorly regulated urban expansion, and warming global temperatures have expanded the geographic range and incidence of the virus in recent decades. This study used phylogenetic and selection pressure analyses to investigate trends in DENV evolution, using whole genome coding sequences from publicly available databases alongside newly sequenced isolates collected between 1963–1997 from Southeast Asia and the Pacific. Results revealed very similar phylogenetic relationships when using the envelope gene and the whole genome coding sequences. Although DENV evolution is predominantly driven by negative selection, a number of amino acid sites undergoing positive selection were found across the genome, with the majority located in the envelope and NS5 genes. Some genotypes appear to be diversifying faster than others within each serotype. The results from this research improve our understanding of DENV evolution, with implications for disease control efforts such as Wolbachia-based biocontrol and vaccine design.
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Affiliation(s)
- Caleb J. Stica
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, 300 Herston Road, Herston, QLD 4006, Australia;
| | - Roberto A. Barrero
- eResearch Office, Division of Research and Innovation, Queensland University of Technology, P Block, 2 George Street, Brisbane, QLD 4000, Australia;
| | - Rachael Z. Murray
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, KG-Q Block, 60 Musk Avenue, Kelvin Grove, Brisbane, QLD 4059, Australia;
| | - Gregor J. Devine
- Mosquito Control Lab, QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, QLD 4006, Australia;
| | - Matthew J. Phillips
- School of Biology and Environmental Science, Queensland University of Technology, R Block, 2 George Street, Brisbane, QLD 4000, Australia;
| | - Francesca D. Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, 300 Herston Road, Herston, QLD 4006, Australia;
- Correspondence:
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12
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Wang P, Zhou R, Zhou R, Li W, Weerasinghe J, Chen S, Rehm BHA, Zhao L, Frentiu FD, Zhang Z, Yan K, Lor M, Suhrbier A, Richard DJ, Thompson EW, Ostrikov KK, Dai X. Cold atmospheric plasma for preventing infection of viruses that use ACE2 for entry. Theranostics 2022; 12:2811-2832. [PMID: 35401827 PMCID: PMC8965494 DOI: 10.7150/thno.70098] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/17/2022] [Indexed: 11/05/2022] Open
Abstract
Rational: The mutating SARS-CoV-2 potentially impairs the efficacy of current vaccines or antibody-based treatments. Broad-spectrum and rapid anti-virus methods feasible for regular epidemic prevention against COVID-19 or alike are urgently called for. Methods: Using SARS-CoV-2 virus and bioengineered pseudoviruses carrying ACE2-binding spike protein domains, we examined the efficacy of cold atmospheric plasma (CAP) on virus entry prevention. Results: We found that CAP could effectively inhibit the entry of virus into cells. Direct CAP or CAP-activated medium (PAM) triggered rapid internalization and nuclear translocation of the virus receptor, ACE2, which began to return after 5 hours and was fully recovered by 12 hours. This was seen in vitro with both VERO-E6 cells and human mammary epithelial MCF10A cells, and in vivo. Hydroxyl radical (·OH) and species derived from its interactions with other species were found to be the most effective CAP components for triggering ACE2 nucleus translocation. The ERα/STAT3(Tyr705) and EGFR(Tyr1068/1086)/STAT3(Tyr705) axes were found to interact and collectively mediate the effects on ACE2 localization and expression. Conclusions: Our data support the use of PAM in helping control SARS-CoV-2 if developed into products for nose/mouth spray; an approach extendable to other viruses utilizing ACE2 for host entry.
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White T, Mincham G, Montgomery BL, Jansen CC, Huang X, Williams CR, Flower RLP, Faddy HM, Frentiu FD, Viennet E. Past and future epidemic potential of chikungunya virus in Australia. PLoS Negl Trop Dis 2021; 15:e0009963. [PMID: 34784371 PMCID: PMC8631637 DOI: 10.1371/journal.pntd.0009963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 11/30/2021] [Accepted: 11/02/2021] [Indexed: 11/18/2022] Open
Abstract
Background Australia is theoretically at risk of epidemic chikungunya virus (CHIKV) activity as the principal vectors are present on the mainland Aedes aegypti) and some islands of the Torres Strait (Ae. aegypti and Ae. albopictus). Both vectors are highly invasive and adapted to urban environments with a capacity to expand their distributions into south-east Queensland and other states in Australia. We sought to estimate the epidemic potential of CHIKV, which is not currently endemic in Australia, by considering exclusively transmission by the established vector in Australia, Ae. aegypti, due to the historical relevance and anthropophilic nature of the vector. Methodology/Principal findings We estimated the historical (1995–2019) epidemic potential of CHIKV in eleven Australian locations, including the Torres Strait, using a basic reproduction number equation. We found that the main urban centres of Northern Australia could sustain an epidemic of CHIKV. We then estimated future trends in epidemic potential for the main centres for the years 2020 to 2029. We also conducted uncertainty and sensitivity analyses on the variables comprising the basic reproduction number and found high sensitivity to mosquito population size, human population size, impact of vector control and human infectious period. Conclusions/Significance By estimating the epidemic potential for CHIKV transmission on mainland Australia and the Torres Strait, we identified key areas of focus for controlling vector populations and reducing human exposure. As the epidemic potential of the virus is estimated to rise towards 2029, a greater focus on control and prevention measures should be implemented in at-risk locations. Chikungunya virus (CHIKV) is transmitted primarily by Aedes aegypti and Aedes albopictus mosquitoes and causes a potentially debilitating febrile and arthralgic disease. The virus is a threat to public health in regions where the primary vectors are established, as evidenced by past epidemics in the Indian Ocean Islands, South America and the Caribbean. In Australia, there are established populations of Ae. aegypti both on the mainland and in the Torres Strait, and of Ae. albopictus in the Torres Strait. This provides a theoretical potential for CHIKV transmission, as seen historically with dengue virus (DENV). It is therefore important to understand the epidemic potential of CHIKV in Australia. We estimated the basic reproduction number (R0) of CHIKV during the years 1995–2019 for 11 Urban Centres and Localities (UCLs) in Australia, and found that Brisbane, Cairns, Darwin, Rockhampton, Thursday Island, and Townsville were all susceptible to CHIKV epidemics. We then forecasted epidemic potential from 2020–2029 and found an increase in R0 across the six main UCLs. By highlighting factors that significantly influence the epidemic potential of CHIKV in Australia, our study supports evidence-based decision making for vector control and public health programs.
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Affiliation(s)
- Timothy White
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
- Research and Development, Australian Red Cross Lifeblood, Kelvin Grove, Queensland, Australia
| | - Gina Mincham
- Research and Innovation Services, University of South Australia, Adelaide, South Australia, Australia
| | - Brian L. Montgomery
- Metro South Public Health Unit, Metro South Hospital and Health Service, Brisbane, Queensland, Australia
| | - Cassie C. Jansen
- Communicable Diseases Branch, Queensland Department of Health, Herston, Queensland, Australia
| | - Xiaodong Huang
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
| | - Craig R. Williams
- UniSA Clinical & Health Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Robert L. P. Flower
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
- Research and Development, Australian Red Cross Lifeblood, Kelvin Grove, Queensland, Australia
| | - Helen M. Faddy
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
- Research and Development, Australian Red Cross Lifeblood, Kelvin Grove, Queensland, Australia
- School of Health and Behavioural Sciences, University of the Sunshine Coast, Petrie, Queensland, Australia
| | - Francesca D. Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
| | - Elvina Viennet
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
- Research and Development, Australian Red Cross Lifeblood, Kelvin Grove, Queensland, Australia
- * E-mail:
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14
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Cheng J, Bambrick H, Frentiu FD, Devine G, Yakob L, Xu Z, Li Z, Yang W, Hu W. Extreme weather events and dengue outbreaks in Guangzhou, China: a time-series quasi-binomial distributed lag non-linear model. Int J Biometeorol 2021; 65:1033-1042. [PMID: 33598765 DOI: 10.1007/s00484-021-02085-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 01/14/2021] [Accepted: 01/19/2021] [Indexed: 06/12/2023]
Abstract
Dengue transmission is climate-sensitive and permissive conditions regularly cause large outbreaks in Asia-Pacific area. As climate change progresses, extreme weather events such as heatwaves and unusually high rainfall are predicted more intense and frequent, but their impacts on dengue outbreaks remain unclear so far. This paper aimed to investigate the relationship between extreme weather events (i.e., heatwaves, extremely high rainfall and extremely high humidity) and dengue outbreaks in China. We obtained daily number of locally acquired dengue cases and weather factors for Guangzhou, China, for the period 2006-2015. The definition of dengue outbreaks was based on daily number of locally acquired cases above the threshold (i.e., mean + 2SD of daily distribution of dengue cases during peaking period). Heatwave was defined as ≥2 days with temperature ≥ 95th percentile, and extreme rainfall and humidity defined as daily values ≥95th percentile during 2006-2015. A generalized additive model was used to examine the associations between extreme weather events and dengue outbreaks. Results showed that all three extreme weather events were associated with increased risk of dengue outbreaks, with a risk increase of 115-251% around 6 weeks after heatwaves, 173-258% around 6-13 weeks after extremely high rainfall, and 572-587% around 6-13 weeks after extremely high humidity. Each extreme weather event also had good capacity in predicting dengue outbreaks, with the model's sensitivity, specificity, accuracy, and area under the receiver operating characteristics curve all exceeding 86%. This study found that heatwaves, extremely high rainfall, and extremely high humidity could act as potential drivers of dengue outbreaks.
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Affiliation(s)
- Jian Cheng
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Queensland, 4059, Australia
- Department of Epidemiology and Biostatistics & Anhui Province Key Laboratory of Major Autoimmune Disease, School of Public Health, Anhui Medical University, Anhui, China
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Queensland, 4059, Australia
| | - Francesca D Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, UK
| | - Zhiwei Xu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Queensland, 4059, Australia
- School of Public Health, Faculty of Medicine, University of Queensland, Brisbane, Australia
| | - Zhongjie Li
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Weizhong Yang
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China
- School of Population Medicine & Public Health, Chinese Academy of Medical Sciences/Peking Union Medical College, Beijing, China
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Queensland, 4059, Australia.
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15
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Cheng J, Bambrick H, Yakob L, Devine G, Frentiu FD, Williams G, Li Z, Yang W, Hu W. Extreme weather conditions and dengue outbreak in Guangdong, China: Spatial heterogeneity based on climate variability. Environ Res 2021; 196:110900. [PMID: 33636184 DOI: 10.1016/j.envres.2021.110900] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 12/19/2020] [Accepted: 02/15/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Previous studies have shown associations between local weather factors and dengue incidence in tropical and subtropical regions. However, spatial variability in those associations remains unclear and evidence is scarce regarding the effects of weather extremes. OBJECTIVES We examined spatial variability in the effects of various weather conditions on the unprecedented dengue outbreak in Guangdong province of China in 2014 and explored how city characteristics modify weather-related risk. METHODS A Bayesian spatial conditional autoregressive model was used to examine the overall and city-specific associations of dengue incidence with weather conditions including (1) average temperature, temperature variation, and average rainfall; and (2) weather extremes including numbers of days of extremely high temperature and high rainfall (both used 95th percentile as the cut-off). This model was run for cumulative dengue cases during five months from July to November (accounting for 99.8% of all dengue cases). A further analysis based on spatial variability was used to validate the modification effects by economic, demographic and environmental factors. RESULTS We found a positive association of dengue incidence with average temperature in seven cities (relative risk (RR) range: 1.032 to 1.153), a positive association with average rainfall in seven cities (RR range: 1.237 to 1.974), and a negative association with temperature variation in four cities (RR range: 0.315 to 0.593). There was an overall positive association of dengue incidence with extremely high temperature (RR:1.054, 95% credible interval (CI): 1.016 to 1.094), without evidence of variation across cities, and an overall positive association of dengue with extremely high rainfall (RR:1.505, 95% CI: 1.096 to 2.080), with seven regions having stronger associations (RR range: 1.237 to 1.418). Greater effects of weather conditions appeared to occur in cities with higher economic level, lower green space coverage and lower elevation. CONCLUSIONS Spatially varied effects of weather conditions on dengue outbreaks necessitate area-specific dengue prevention and control measures. Extremes of temperature and rainfall have strong and positive associations with dengue outbreaks.
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Affiliation(s)
- Jian Cheng
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia; Department of Epidemiology and Biostatistics & Anhui Province Key Laboratory of Major Autoimmune Disease, School of Public Health, Anhui Medical University, Anhui, China
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Francesca D Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Gail Williams
- School of Public Health, University of Queensland, Brisbane, Australia
| | - Zhongjie Li
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Weizhong Yang
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; School of Population Medicine & Public Health, Chinese Academy of Medical Sciences/Peking Union Medical College, Beijing, China
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia.
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16
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Davis C, Murphy AK, Bambrick H, Devine GJ, Frentiu FD, Yakob L, Huang X, Li Z, Yang W, Williams G, Hu W. A regional suitable conditions index to forecast the impact of climate change on dengue vectorial capacity. Environ Res 2021; 195:110849. [PMID: 33561446 DOI: 10.1016/j.envres.2021.110849] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/22/2020] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND The mosquitoes Aedes aegypti and Ae. albopictus are the primary vectors of dengue virus, and their geographic distributions are predicted to expand further with economic development, and in response to climate change. We aimed to estimate the impact of future climate change on dengue transmission through the development of a Suitable Conditions Index (SCI), based on climatic variables known to support vectorial capacity. We calculated the SCI based on various climate change scenarios for six countries in the Asia-Pacific region (Australia, China, Indonesia, The Philippines, Thailand and Vietnam). METHODS Monthly raster climate data (temperature and precipitation) were collected for the period January 2005 to December 2018 along with projected climate estimates for the years 2030, 2050 and 2070 using Representative Concentration Pathway (RCP) 4·5, 6·0 and 8·5 emissions scenarios. We defined suitable temperature ranges for dengue transmission of between 17·05-34·61 °C for Ae. aegypti and 15·84-31·51 °C for Ae. albopictus and then developed a historical and predicted SCI based on weather variability to measure the expected geographic limits of dengue vectorial capacity. Historical and projected SCI values were compared through difference maps for the six countries. FINDINGS Comparing different emission scenarios across all countries, we found that most South East Asian countries showed either a stable pattern of high suitability, or a potential decline in suitability for both vectors from 2030 to 2070, with a declining pattern particularly evident for Ae. albopictus. Temperate areas of both China and Australia showed a less stable pattern, with both moderate increases and decreases in suitability for each vector in different regions between 2030 and 2070. INTERPRETATION The SCI will be a useful index for forecasting potential dengue risk distributions in response to climate change, and independently of the effects of human activity. When considered alongside additional correlates of infection such as human population density and socioeconomic development indicators, the SCI could be used to develop an early warning system for dengue transmission.
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Affiliation(s)
- Callan Davis
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Amanda K Murphy
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia; Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Gregor J Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Francesca D Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Laith Yakob
- Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
| | - Xiaodong Huang
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Zhongjie Li
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Weizhong Yang
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; School of Population Medicine & Public Health, Chinese Academy of Medical Sciences/Peking Union Medical College, Beijing, China
| | - Gail Williams
- School of Public Health, University of Queensland, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia.
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17
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Wimalasiri-Yapa BMCR, Barrero RA, Stassen L, Hafner LM, McGraw EA, Pyke AT, Jansen CC, Suhrbier A, Yakob L, Hu W, Devine GJ, Frentiu FD. Temperature modulates immune gene expression in mosquitoes during arbovirus infection. Open Biol 2021; 11:200246. [PMID: 33401993 PMCID: PMC7881175 DOI: 10.1098/rsob.200246] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The principal vector of dengue, Zika and chikungunya viruses is the mosquito Aedes aegypti, with its ability to transmit pathogens influenced by ambient temperature. We use chikungunya virus (CHIKV) to understand how the mosquito transcriptome responds to arbovirus infection at different ambient temperatures. We exposed CHIKV-infected mosquitoes to 18, 28 and 32°C, and found that higher temperature correlated with higher virus levels, particularly at 3 days post infection, but lower temperature resulted in reduced virus levels. RNAseq analysis indicated significantly altered gene expression levels in CHIKV infection. The highest number of significantly differentially expressed genes was observed at 28°C, with a more muted effect at the other temperatures. At the higher temperature, the expression of many classical immune genes, including Dicer-2, was not substantially altered in response to CHIKV. The upregulation of Toll, IMD and JAK-STAT pathways was only observed at 28°C. Functional annotations suggested that genes in immune response and metabolic pathways related to energy supply and DNA replication were involved in temperature-dependent changes. Time post infection also led to substantially different gene expression profiles, and this varied with temperature. In conclusion, temperature significantly modulates mosquito gene expression in response to infection, potentially leading to impairment of immune defences at higher temperatures.
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Affiliation(s)
- B M C Randika Wimalasiri-Yapa
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia.,Department of Medical Laboratory Sciences, Faculty of Health Science, Open University of Sri Lanka, Nugegoda, Colombo, Sri Lanka
| | - Roberto A Barrero
- eResearch Office, Division of Research and Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Liesel Stassen
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Louise M Hafner
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Elizabeth A McGraw
- Center for Infectious Disease Dynamics, Department of Entomology, The Pennsylvania State University, University Park, PA 16801, USA
| | - Alyssa T Pyke
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, Queensland, Australia
| | - Cassie C Jansen
- Communicable Diseases Branch, Department of Health, Queensland Government, Herston, Queensland, Australia
| | - Andreas Suhrbier
- Inflammation Biology, QIMR Berghofer Medical Research Institute, Brisbane, Queensland 4006, Australia
| | - Laith Yakob
- London School of Hygiene and Tropical Medicine, London, UK
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Gregor J Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Francesca D Frentiu
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
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18
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Murphy AK, Clennon JA, Vazquez-Prokopec G, Jansen CC, Frentiu FD, Hafner LM, Hu W, Devine GJ. Spatial and temporal patterns of Ross River virus in south east Queensland, Australia: identification of hot spots at the rural-urban interface. BMC Infect Dis 2020; 20:722. [PMID: 33008314 PMCID: PMC7530966 DOI: 10.1186/s12879-020-05411-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 09/10/2020] [Indexed: 12/02/2022] Open
Abstract
Background Ross River virus (RRV) is responsible for the most common vector-borne disease of humans reported in Australia. The virus circulates in enzootic cycles between multiple species of mosquitoes, wildlife reservoir hosts and humans. Public health concern about RRV is increasing due to rising incidence rates in Australian urban centres, along with increased circulation in Pacific Island countries. Australia experienced its largest recorded outbreak of 9544 cases in 2015, with the majority reported from south east Queensland (SEQ). This study examined potential links between disease patterns and transmission pathways of RRV. Methods The spatial and temporal distribution of notified RRV cases, and associated epidemiological features in SEQ, were analysed for the period 2001–2016. This included fine-scale analysis of disease patterns across the suburbs of the capital city of Brisbane, and those of 8 adjacent Local Government Areas, and host spot analyses to identify locations with significantly high incidence. Results The mean annual incidence rate for the region was 41/100,000 with a consistent seasonal peak in cases between February and May. The highest RRV incidence was in adults aged from 30 to 64 years (mean incidence rate: 59/100,000), and females had higher incidence rates than males (mean incidence rates: 44/100,000 and 34/100,000, respectively). Spatial patterns of disease were heterogeneous between years, and there was a wide distribution of disease across both urban and rural areas of SEQ. Overall, the highest incidence rates were reported from predominantly rural suburbs to the north of Brisbane City, with significant hot spots located in peri-urban suburbs where residential, agricultural and conserved natural land use types intersect. Conclusions Although RRV is endemic across all of SEQ, transmission is most concentrated in areas where urban and peri-urban environments intersect. The drivers of RRV transmission across rural-urban landscapes should be prioritised for further investigation, including identification of specific vectors and hosts that mediate human spillover.
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Affiliation(s)
- Amanda K Murphy
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia. .,School of Biomedical Sciences, Faculty of Health, and Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.
| | - Julie A Clennon
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, USA
| | | | - Cassie C Jansen
- Communicable Diseases Branch, Queensland Health, Herston, Australia
| | - Francesca D Frentiu
- School of Biomedical Sciences, Faculty of Health, and Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Louise M Hafner
- School of Biomedical Sciences, Faculty of Health, and Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Gregor J Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
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19
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Ekwudu O, Marquart L, Webb L, Lowry KS, Devine GJ, Hugo LE, Frentiu FD. Effect of Serotype and Strain Diversity on Dengue Virus Replication in Australian Mosquito Vectors. Pathogens 2020; 9:pathogens9080668. [PMID: 32824792 PMCID: PMC7460537 DOI: 10.3390/pathogens9080668] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 08/13/2020] [Accepted: 08/17/2020] [Indexed: 11/18/2022] Open
Abstract
Dengue virus (DENV) is the most important mosquito-borne viral pathogen of humans, comprising four serotypes (DENV-1 to -4) with a myriad of genotypes and strains. The kinetics of DENV replication within the mosquito following ingestion of a blood meal influence the pathogen’s ability to reach the salivary glands and thus the transmission potential. The influence of DENV serotype and strain diversity on virus kinetics in the two main vector species, Aedes aegypti and Ae. albopictus, has been poorly characterized. We tested whether DENV replication kinetics vary systematically among serotypes and strains, using Australian strains of the two vectors. Mosquitoes were blood fed with two strains per serotype, and sampled at 3, 6, 10 and 14-days post-exposure. Virus infection in mosquito bodies, and dissemination of virus to legs and wings, was detected using qRT-PCR. For both vectors, we found significant differences among serotypes in proportions of mosquitoes infected, with higher numbers for DENV-1 and -2 versus other serotypes. Consistent with this, we observed that DENV-1 and -2 generally replicated to higher RNA levels than other serotypes, particularly at earlier time points. There were no significant differences in either speed of infection or dissemination between the mosquito species. Our results suggest that DENV diversity may have important epidemiological consequences by influencing virus kinetics in mosquito vectors.
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Affiliation(s)
- O’mezie Ekwudu
- Institute of Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Brisbane 4000, Australia; (O.E.); (K.S.L.)
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane 4006, Australia; (G.J.D.); (L.E.H.)
- Department of Microbiology, Chukwuemeka Odumegwu Ojukwu University, Uli 431124, Nigeria
| | - Louise Marquart
- Statistics Unit, QIMR Berghofer Medical Research Institute, Brisbane 4006, Australia; (L.M.); (L.W.)
- Clinical Malaria, QIMR Berghofer Medical Research Institute, Brisbane 4006, Australia
| | - Lachlan Webb
- Statistics Unit, QIMR Berghofer Medical Research Institute, Brisbane 4006, Australia; (L.M.); (L.W.)
| | - Kym S. Lowry
- Institute of Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Brisbane 4000, Australia; (O.E.); (K.S.L.)
| | - Gregor J. Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane 4006, Australia; (G.J.D.); (L.E.H.)
| | - Leon E. Hugo
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane 4006, Australia; (G.J.D.); (L.E.H.)
| | - Francesca D. Frentiu
- Institute of Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Brisbane 4000, Australia; (O.E.); (K.S.L.)
- Correspondence:
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Viennet E, Frentiu FD, Williams CR, Mincham G, Jansen CC, Montgomery BL, Flower RLP, Faddy HM. Estimation of mosquito-borne and sexual transmission of Zika virus in Australia: Risks to blood transfusion safety. PLoS Negl Trop Dis 2020; 14:e0008438. [PMID: 32663213 PMCID: PMC7380650 DOI: 10.1371/journal.pntd.0008438] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 07/24/2020] [Accepted: 06/01/2020] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND Since 2015, Zika virus (ZIKV) outbreaks have occurred in the Americas and the Pacific involving mosquito-borne and sexual transmission. ZIKV has also emerged as a risk to global blood transfusion safety. Aedes aegypti, a mosquito well established in north and some parts of central and southern Queensland, Australia, transmits ZIKV. Aedes albopictus, another potential ZIKV vector, is a threat to mainland Australia. Since these conditions create the potential for local transmission in Australia and a possible uncertainty in the effectiveness of blood donor risk-mitigation programs, we investigated the possible impact of mosquito-borne and sexual transmission of ZIKV in Australia on local blood transfusion safety. METHODOLOGY/PRINCIPAL FINDINGS We estimated 'best-' and 'worst-' case scenarios of monthly reproduction number (R0) for both transmission pathways of ZIKV from 1996-2015 in 11 urban or regional population centres, by varying epidemiological and entomological estimates. We then estimated the attack rate and subsequent number of infectious people to quantify the ZIKV transfusion-transmission risk using the European Up-Front Risk Assessment Tool. For all scenarios and with both vector species R0 was lower than one for ZIKV transmission. However, a higher risk of a sustained outbreak was estimated for Cairns, Rockhampton, Thursday Island, and theoretically in Darwin during the warmest months of the year. The yearly estimation of the risk of transmitting ZIKV infection by blood transfusion remained low through the study period for all locations, with the highest potential risk estimated in Darwin. CONCLUSIONS/SIGNIFICANCE Given the increasing demand for plasma products in Australia, the current strategy of restricting donors returning from infectious disease outbreak regions to source plasma collection provides a simple and effective risk management approach. However, if local transmission was suspected in the main urban centres of Australia, potentially facilitated by the geographic range expansion of Ae. aegypti or Ae. albopictus, this mitigation strategy would need urgent review.
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Affiliation(s)
- Elvina Viennet
- Research and Development, Australian Red Cross Lifeblood, Kelvin Grove, Queensland, Australia
- Institute for Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Queensland, Australia
- * E-mail:
| | - Francesca D. Frentiu
- Institute for Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Queensland, Australia
| | - Craig R. Williams
- Australian Centre for Precision Health, University of South Australia, Adelaide, South Australia, Australia
| | - Gina Mincham
- Australian Centre for Precision Health, University of South Australia, Adelaide, South Australia, Australia
| | - Cassie C. Jansen
- Communicable Diseases Branch, Queensland Department of Health, Herston, Queensland, Australia
| | - Brian L. Montgomery
- Metro South Public Health Unit, Metro South Hospital and Health Service, Brisbane, Queensland, Australia
| | - Robert L. P. Flower
- Research and Development, Australian Red Cross Lifeblood, Kelvin Grove, Queensland, Australia
- Institute for Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Queensland, Australia
| | - Helen M. Faddy
- Research and Development, Australian Red Cross Lifeblood, Kelvin Grove, Queensland, Australia
- Institute for Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Queensland, Australia
- School of Health and Sport Sciences, University of the Sunshine Coast, Queensland, Australia
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Xu Z, Bambrick H, Yakob L, Devine G, Frentiu FD, Villanueva Salazar F, Bonsato R, Hu W. High relative humidity might trigger the occurrence of the second seasonal peak of dengue in the Philippines. Sci Total Environ 2020; 708:134849. [PMID: 31806327 DOI: 10.1016/j.scitotenv.2019.134849] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 09/09/2019] [Accepted: 10/04/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Dengue in some regions has a bimodal seasonal pattern, with a first big seasonal peak followed by a second small seasonal peak. The factors associated with the second small seasonal peak remain unclear. METHODS Monthly data on dengue cases in the Philippines and its 17 regions from 2008 to 2017 were collected and underwent a time series seasonal decomposition analysis. The associations of monthly average mean temperature, average relative humidity, and total rainfall with dengue in 19 provinces were assessed with a generalized additive model. Logistic regression and a classification and regression tree (CART) model were used to identify the factors associated with the second seasonal peak of dengue. RESULTS Dengue incidence rate in the Philippines increased substantially in the period 2013-2017, particularly for the regions in south Philippines. Dengue peaks in south Philippines predominantly occurred in August, with the peak in the national capital region (NCR) (i.e., Metropolitan Manila) occurring in September. The association between mean temperature and dengue appeared J-shaped or upside-down-V-shaped, and the association between relative humidity (or rainfall) and dengue was heterogeneous across different provinces (e.g., J shape, reverse J shape, or upside-down V shape, etc). Relative humidity was the only factor associated with the second seasonal peak of dengue (odds ratio: 1.144; 95% confidence interval: 1.023-1.279; threshold: 77%). CONCLUSIONS Dengue control and prevention resources are increasingly required in regions beyond the NCR, and relative humidity can be used as a predictor of the second seasonal peak of dengue in the Philippines.
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Affiliation(s)
- Zhiwei Xu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane 4059, Australia; Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane 4059, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane 4059, Australia; Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane 4059, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane 4006, Australia
| | - Francesca D Frentiu
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane 4059, Australia; School of Biomedical Sciences, Queensland University of Technology, Brisbane 4059, Australia
| | | | - Ryan Bonsato
- Research Institute for Tropical Medicine, Muntinlupa City 1781, Philippines
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane 4059, Australia; Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane 4059, Australia.
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Xu Z, Bambrick H, Frentiu FD, Devine G, Yakob L, Williams G, Hu W. Projecting the future of dengue under climate change scenarios: Progress, uncertainties and research needs. PLoS Negl Trop Dis 2020; 14:e0008118. [PMID: 32119666 PMCID: PMC7067491 DOI: 10.1371/journal.pntd.0008118] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 03/12/2020] [Accepted: 02/05/2020] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Dengue is a mosquito-borne viral disease and its transmission is closely linked to climate. We aimed to review available information on the projection of dengue in the future under climate change scenarios. METHODS Using five databases (PubMed, ProQuest, ScienceDirect, Scopus and Web of Science), a systematic review was conducted to retrieve all articles from database inception to 30th June 2019 which projected the future of dengue under climate change scenarios. In this review, "the future of dengue" refers to disease burden of dengue, epidemic potential of dengue cases, geographical distribution of dengue cases, and population exposed to climatically suitable areas of dengue. RESULTS Sixteen studies fulfilled the inclusion criteria, and five of them projected a global dengue future. Most studies reported an increase in disease burden, a wider spatial distribution of dengue cases or more people exposed to climatically suitable areas of dengue as climate change proceeds. The years 1961-1990 and 2050 were the most commonly used baseline and projection periods, respectively. Multiple climate change scenarios introduced by the Intergovernmental Panel on Climate Change (IPCC), including B1, A1B, and A2, as well as Representative Concentration Pathway 2.6 (RCP2.6), RCP4.5, RCP6.0 and RCP8.5, were most widely employed. Instead of projecting the future number of dengue cases, there is a growing consensus on using "population exposed to climatically suitable areas for dengue" or "epidemic potential of dengue cases" as the outcome variable. Future studies exploring non-climatic drivers which determine the presence/absence of dengue vectors, and identifying the pivotal factors triggering the transmission of dengue in those climatically suitable areas would help yield a more accurate projection for dengue in the future. CONCLUSIONS Projecting the future of dengue requires a systematic consideration of assumptions and uncertainties, which will facilitate the development of tailored climate change adaptation strategies to manage dengue.
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Affiliation(s)
- Zhiwei Xu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Francesca D. Frentiu
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Gail Williams
- School of Public Health, University of Queensland, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
- * E-mail:
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Ekwudu O, Devine GJ, Aaskov JG, Frentiu FD. Wolbachia strain wAlbB blocks replication of flaviviruses and alphaviruses in mosquito cell culture. Parasit Vectors 2020; 13:54. [PMID: 32041638 PMCID: PMC7011541 DOI: 10.1186/s13071-020-3936-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 02/03/2020] [Indexed: 11/10/2022] Open
Abstract
Background Wolbachia pipientis are bacterial endosymbionts of arthropods currently being implemented as biocontrol agents to reduce the global burden of arboviral diseases. Some strains of Wolbachia, when introduced into Aedes aegypti mosquitoes, reduce or block the replication of RNA viruses pathogenic to humans. The wAlbB strain of Wolbachia was originally isolated from Aedes albopictus, and when transinfected into Ae. aegypti, persists in mosquitoes under high temperature conditions longer than other strains. The utility of wAlbB to block a broad spectrum of RNA viruses has received limited attention. Here we test the ability of wAlbB to reduce or block the replication of a range of Flavivirus and Alphavirus species in cell culture. Methods The C6/36 mosquito cell line was stably infected with the wAlbB strain using the shell-vial technique. The replication of dengue, West Nile and three strains of Zika (genus Flavivirus), and Ross River, Barmah Forest and Sindbis (genus Alphavirus) viruses was compared in wAlbB-infected cells with Wolbachia-free controls. Infectious virus titres were determined using either immunofocus or plaque assays. A general linear model was used to test for significant differences in replication between flaviviruses and alphaviruses. Results Titres of all viruses were significantly reduced in cell cultures infected with wAlbB versus Wolbachia-free controls. The magnitude of reduction in virus yields varied among virus species and, within species, also among the strains utilized. Conclusion Our results suggest that wAlbB infection of arthropods could be used to reduce transmission of a wide range of pathogenic RNA viruses.![]()
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Affiliation(s)
- O'mezie Ekwudu
- School of Biomedical Sciences and Institute of Health and Biomedical Innovation, Queensland University of Technology, Herston, QLD, 4006, Australia.,Department of Microbiology, Chukwuemeka Odumegwu Ojukwu University, Uli, Nigeria.,Mosquito Control Laboratory, Queensland Institute of Medical Research Berghofer, Herston, QLD, 4006, Australia
| | - Gregor J Devine
- Mosquito Control Laboratory, Queensland Institute of Medical Research Berghofer, Herston, QLD, 4006, Australia
| | - John G Aaskov
- School of Biomedical Sciences and Institute of Health and Biomedical Innovation, Queensland University of Technology, Herston, QLD, 4006, Australia
| | - Francesca D Frentiu
- School of Biomedical Sciences and Institute of Health and Biomedical Innovation, Queensland University of Technology, Herston, QLD, 4006, Australia.
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Cheng J, Bambrick H, Yakob L, Devine G, Frentiu FD, Toan DTT, Thai PQ, Xu Z, Hu W. Heatwaves and dengue outbreaks in Hanoi, Vietnam: New evidence on early warning. PLoS Negl Trop Dis 2020; 14:e0007997. [PMID: 31961869 PMCID: PMC6994101 DOI: 10.1371/journal.pntd.0007997] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 01/31/2020] [Accepted: 12/16/2019] [Indexed: 01/15/2023] Open
Abstract
Background Many studies have shown associations between rising temperatures, El Niño events and dengue incidence, but the effect of sustained periods of extreme high temperatures (i.e., heatwaves) on dengue outbreaks has not yet been investigated. This study aimed to compare the short-term temperature-dengue associations during different dengue outbreak periods, estimate the dengue cases attributable to temperature, and ascertain if there was an association between heatwaves and dengue outbreaks in Hanoi, Vietnam. Methodology/Principal findings Dengue outbreaks were assigned to one of three categories (small, medium and large) based on the 50th, 75th, and 90th percentiles of distribution of weekly dengue cases during 2008–2016. Using a generalised linear regression model with a negative binomial link that controlled for temporal trends, temperature variation, rainfall and population size over time, we examined and compared associations between weekly average temperature and weekly dengue incidence for different outbreak categories. The same model using weeks with or without heatwaves as binary variables was applied to examine the potential effects of extreme heatwaves, defined as seven or more days with temperatures above the 95th percentile of daily temperature distribution during the study period. This study included 55,801 dengue cases, with an average of 119 (range: 0 to 1454) cases per week. The exposure-response relationship between temperature and dengue risk was non-linear and differed with dengue category. After considering the delayed effects of temperature (one week lag), we estimated that 4.6%, 11.6%, and 21.9% of incident cases during small, medium, and large outbreaks were attributable to temperature. We found evidence of an association between heatwaves and dengue outbreaks, with longer delayed effects on large outbreaks (around 14 weeks later) than small and medium outbreaks (4 to 9 weeks later). Compared with non-heatwave years, dengue outbreaks (i.e., small, moderate and large outbreaks combined) in heatwave years had higher weekly number of dengue cases (p<0.05). Findings were robust under different sensitivity analyses. Conclusions The short-term association between temperature and dengue risk varied by the level of outbreaks and temperature seems more likely affect large outbreaks. Moreover, heatwaves may delay the timing and increase the magnitude of dengue outbreaks. Dengue fever is one of the most common mosquito-borne viral diseases. Weather extremes such as El Niño event and extreme hot summer can affect dengue incidence rate and dengue outbreaks. More frequent, more intensive and longer lasting heatwaves in the 21st century is anticipated because of global warming, making it necessary to investigate the association between heatwaves and dengue outbreaks. In this study, we estimated 4.6%, 11.6%, and 21.9% of incident dengue cases during small, medium, and large outbreaks attributable to temperature in Hanoi, Vietnam. We also found evidence of an association between heatwaves and dengue outbreaks, with longer delayed effects on large outbreaks than small and medium outbreaks. Compared with non-heatwave years, dengue outbreaks in heatwave years had higher number of dengue cases. Heatwave weather may represent an emerging risk factor or predicator of dengue outbreaks in tropical regions. Future dengue prediction models incorporating heatwaves may help increase the accuracy of predictability.
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Affiliation(s)
- Jian Cheng
- School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Francesca D. Frentiu
- School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Do Thi Thanh Toan
- Institute of Preventive Medicine and Public Health, Hanoi Medical University, Hanoi, Vietnam
| | - Pham Quang Thai
- Institute of Preventive Medicine and Public Health, Hanoi Medical University, Hanoi, Vietnam
- Communicable Disease Control Department, National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
| | - Zhiwei Xu
- School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
- * E-mail:
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Xu Z, Bambrick H, Pongsumpun P, Ming Tang I, Yakob L, Devine G, Frentiu FD, Williams G, Hu W. Does Bangkok have a central role in the dengue dynamics of Thailand? Parasit Vectors 2020; 13:22. [PMID: 31931886 PMCID: PMC6958813 DOI: 10.1186/s13071-020-3892-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 01/07/2020] [Indexed: 01/28/2023] Open
Abstract
Background Bangkok plays a central role in the commerce of Thailand. This study aimed to characterize the district-level spatial-temporal patterns of dengue in Thailand and explore if a dengue peak in Bangkok led the peaks of dengue in other Thai provinces. Methods Monthly dengue data at district level in Thailand from January 2004 to December 2017 were obtained and used to assess the spatial and seasonal patterns of dengue in Thailand. As our seasonal decomposition and cross-correlation analyses showed that dengue in Bangkok peaked in November, which was a few months after the dengue peak in most other provinces, we used a time-series generalized linear model to explore if there was another province in which the dengue case number was most predictive of dengue case numbers in other Thai provinces. Results The highest district-level annual dengue incidence rates (per 10,000) in the three time periods (i.e. 2004–2008, 2009–2013 and 2014–2017) were 58.08 (Samphanthawong), 85.93 (Mueang Krabi), and 66.60 (Mae Sariang), respectively. Dengue incidence rates in the western part of Northern Thailand, southern part of Central Thailand, southern part of Eastern Thailand, and Southern Thailand were higher than in other regions. Dengue in most districts of Thailand peaked in June, July or August, but dengue peaks in all districts of Bangkok occurred in November. The number of dengue cases in Nakhon Ratchasima was most predictive of the number of dengue cases in other provinces in Thailand by a one-month lag. Conclusions Our results suggest that the dengue peak in Bangkok did not lead the peaks of dengue in other Thai provinces. Future research exploring how changes in socio-ecological factors (e.g. road network and climate factors) in Nakhon Ratchasima have affected the transmission of dengue in Thailand might shed some new light on the prevention and control of dengue.
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Affiliation(s)
- Zhiwei Xu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, 4059, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia.,School of Public Health, Faculty of Medicine, University of Queensland, Brisbane, 4006, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, 4059, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia
| | - Puntani Pongsumpun
- Department of Mathematics, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
| | - I Ming Tang
- Computational & Applied Science for Smart Innovation Cluster (CLASSIC), Faculty of Science, King Mongkut's University of Technology Thonburi, Bangkok, 10140, Thailand
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, WC1H 9SH, UK
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, 4006, Australia
| | - Francesca D Frentiu
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia.,School of Biomedical Sciences, Queensland University of Technology, Brisbane, 4059, Australia
| | - Gail Williams
- School of Public Health, Faculty of Medicine, University of Queensland, Brisbane, 4006, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, 4059, Australia. .,Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia.
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Xu Z, Bambrick H, Yakob L, Devine G, Frentiu FD, Marina R, Dhewantara PW, Nusa R, Sasmono RT, Hu W. Using dengue epidemics and local weather in Bali, Indonesia to predict imported dengue in Australia. Environ Res 2019; 175:213-220. [PMID: 31136953 DOI: 10.1016/j.envres.2019.05.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 05/09/2019] [Accepted: 05/14/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Although the association between dengue in Bali, Indonesia, and imported dengue in Australia has been widely asserted, no study has quantified this association so far. METHODS Monthly data on dengue and climatic factors over the past decade for Bali and Jakarta as well as monthly data on imported dengue in Australia underwent a three-stage analysis. Stage I: a quasi-Poisson regression with distributed lag non-linear model was used to assess the associations of climatic factors with dengue in Bali. Stage II: a generalized additive model was used to quantify the association of dengue in Bali with imported dengue in Australia with and without including the number of travelers in log scale as an offset. Stage III: the associations of mean temperature and rainfall (two climatic factors identified in stage I) in Bali with imported dengue in Australia were examined using stage I approach. RESULTS The number of dengue cases in Bali increased with increasing mean temperature, and, up to a certain level, it also increased with increasing rainfall but dropped off for high levels of rainfall. Above a monthly incidence of 1.05 cases per 100,000, dengue in Bali was almost linearly associated with imported dengue in Australia at a lag of one month. Mean temperature (relative risk (RR) per 0.5 °C increase: 2.95, 95% confidence interval (CI): 1.87, 4.66) and rainfall (RR per 7.5 mm increase: 3.42, 95% CI: 1.07, 10.92) in Bali were significantly associated with imported dengue in Australia at a lag of four months. CONCLUSIONS This study suggests that climatic factors (i.e., mean temperature and rainfall) known to be conducive of dengue transmission in Bali can provide an early warning with 4-month lead time for Australia in order to mitigate future outbreaks of local dengue in Australia. This study also provides a template and framework for future surveillance of travel-related infectious diseases globally.
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Affiliation(s)
- Zhiwei Xu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, 4059, Australia; Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, 4059, Australia; Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, WC1H 9SH, UK
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, 4006, Australia
| | - Francesca D Frentiu
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia; School of Biomedical Sciences, Queensland University of Technology, Brisbane, 4059, Australia
| | - Rina Marina
- Center of Public Health Effort Research and Development, National Institute of Health Research and Development, Jakarta, 10560, Indonesia
| | - Pandji Wibawa Dhewantara
- UQ Spatial Epidemiology Laboratory, School of Veterinary Science, University of Queensland, Gatton, 4343, Australia; Pangandaran Unit for Health Research and Development, National Institute of Health Research and Development, Ministry of Health of Indonesia, Pangandaran, 46396, Indonesia
| | - Roy Nusa
- Indonesian Ministry of Health, Jakarta, 12950, Indonesia
| | - R Tedjo Sasmono
- Eijkman Institute for Molecular Biology, Jakarta, 10430, Indonesia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, 4059, Australia; Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, 4059, Australia.
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Wimalasiri-Yapa BMCR, Stassen L, Huang X, Hafner LM, Hu W, Devine GJ, Yakob L, Jansen CC, Faddy HM, Viennet E, Frentiu FD. Chikungunya virus in Asia - Pacific: a systematic review. Emerg Microbes Infect 2019; 8:70-79. [PMID: 30866761 PMCID: PMC6455125 DOI: 10.1080/22221751.2018.1559708] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Chikungunya virus (CHIKV) is a mosquito-borne pathogen that causes an acute febrile syndrome and severe, debilitating rheumatic disorders in humans that may persist for months. CHIKV’s presence in Asia dates from at least 1954, but its epidemiological profile in the region remains poorly understood. We systematically reviewed CHIKV emergence, epidemiology, clinical features, atypical manifestations and distribution of virus genotypes, in 47 countries from South East Asia (SEA) and the Western Pacific Region (WPR) during the period 1954–2017. Following the Cochrane Collaboration guidelines, Pubmed and Scopus databases, surveillance reports available in the World Health Organisation (WHO) and government websites were systematically reviewed. Of the 3504 records identified, 461 were retained for data extraction. Although CHIKV has been circulating in Asia almost continuously since the 1950s, it has significantly expanded its geographic reach in the region from 2005 onwards. Most reports identified in the review originated from India. Although all ages and both sexes can be affected, younger children and the elderly are more prone to severe and occasionally fatal forms of the disease, with child fatalities recorded since 1963 from India. The most frequent clinical features identified were arthralgia, rash, fever and headache. Both the Asian and East-Central-South African (ECSA) genotypes circulate in SEA and WPR, with ECSA genotype now predominant. Our findings indicate a substantial but poorly documented burden of CHIKV infection in the Asia-Pacific region. An evidence-based consensus on typical clinical features of chikungunya could aid in enhanced diagnosis and improved surveillance of the disease.
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Affiliation(s)
- B M C Randika Wimalasiri-Yapa
- a Institute of Health and Biomedical Innovation, School of Biomedical Sciences , Queensland University of Technology , Brisbane , QLD , Australia.,b Department of Medical Laboratory Sciences, Faculty of Health Sciences , The Open University of Sri Lanka , Colombo , Sri Lanka
| | - Liesel Stassen
- a Institute of Health and Biomedical Innovation, School of Biomedical Sciences , Queensland University of Technology , Brisbane , QLD , Australia
| | - Xiaodong Huang
- a Institute of Health and Biomedical Innovation, School of Biomedical Sciences , Queensland University of Technology , Brisbane , QLD , Australia
| | - Louise M Hafner
- a Institute of Health and Biomedical Innovation, School of Biomedical Sciences , Queensland University of Technology , Brisbane , QLD , Australia
| | - Wenbiao Hu
- c Institute of Health and Biomedical Innovation, School of Public Health and Social Work , Queensland University of Technology , Brisbane , QLD , Australia
| | - Gregor J Devine
- d Mosquito Control Laboratory , QIMR Berghofer Medical Research Institute , Brisbane , QLD , Australia
| | - Laith Yakob
- e Department of Disease Control, Faculty of Infectious & Tropical Diseases , The London School of Hygiene & Tropical Medicine , London , UK
| | - Cassie C Jansen
- f Communicable Diseases Branch, Department of Health , Queensland Government , Herston , QLD , Australia
| | - Helen M Faddy
- g Research and Development , Australian Red Cross Blood Service , Brisbane , QLD , Australia
| | - Elvina Viennet
- g Research and Development , Australian Red Cross Blood Service , Brisbane , QLD , Australia
| | - Francesca D Frentiu
- a Institute of Health and Biomedical Innovation, School of Biomedical Sciences , Queensland University of Technology , Brisbane , QLD , Australia
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Hugo LE, Stassen L, La J, Gosden E, Ekwudu O, Winterford C, Viennet E, Faddy HM, Devine GJ, Frentiu FD. Vector competence of Australian Aedes aegypti and Aedes albopictus for an epidemic strain of Zika virus. PLoS Negl Trop Dis 2019; 13:e0007281. [PMID: 30946747 PMCID: PMC6467424 DOI: 10.1371/journal.pntd.0007281] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 04/16/2019] [Accepted: 03/05/2019] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Recent epidemics of Zika virus (ZIKV) in the Pacific and the Americas have highlighted its potential as an emerging pathogen of global importance. Both Aedes (Ae.) aegypti and Ae. albopictus are known to transmit ZIKV but variable vector competence has been observed between mosquito populations from different geographical regions and different virus strains. Since Australia remains at risk of ZIKV introduction, we evaluated the vector competence of local Ae. aegypti and Ae. albopictus for a Brazilian epidemic ZIKV strain. In addition, we evaluated the impact of daily temperature fluctuations around a mean of 28°C on ZIKV transmission and extrinsic incubation period. METHODOLOGY/PRINCIPAL FINDINGS Mosquitoes were orally challenged with a Brazilian ZIKV strain (8.8 log CCID50/ml) and maintained at either 28°C constant or fluctuating temperature conditions. At 3, 7 and 14 days post-infection (dpi), ZIKV RNA copies were quantified in mosquito bodies, as well as wings and legs, using qRT-PCR, while virus antigen in saliva (a proxy for transmission) was detected using a cell culture ELISA. Despite high body and disseminated infection rates in both vectors, the transmission rates of ZIKV in saliva of Ae. aegypti (50-60%) were significantly higher than in Ae. albopictus (10%) at 14 dpi. Both species supported a high viral load in bodies, with no significant differences between constant and fluctuating temperature conditions. However, a significant difference in viral load in wings and legs between species was observed, with higher titres in Ae. aegypti maintained at constant temperature conditions. For ZIKV transmission to occur in Ae. aegypti, a disseminated virus load threshold of 7.59 log10 copies had to be reached. CONCLUSIONS/SIGNIFICANCE Australian Ae. aegypti are better able to transmit a Brazilian ZIKV strain than Ae. albopictus. The results are in agreement with the global consensus that Ae. aegypti is the major vector of ZIKV.
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Affiliation(s)
- Leon E. Hugo
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Liesel Stassen
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences Queensland University of Technology, Brisbane, Queensland, Australia
| | - Jessica La
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences Queensland University of Technology, Brisbane, Queensland, Australia
| | - Edward Gosden
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences Queensland University of Technology, Brisbane, Queensland, Australia
| | - O’mezie Ekwudu
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences Queensland University of Technology, Brisbane, Queensland, Australia
| | - Clay Winterford
- QIMR Berghofer Histotechnology Facility, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Elvina Viennet
- Research and Development, Australian Red Cross Blood Service, Brisbane, Queensland, Australia
| | - Helen M. Faddy
- Research and Development, Australian Red Cross Blood Service, Brisbane, Queensland, Australia
| | - Gregor J. Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Francesca D. Frentiu
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences Queensland University of Technology, Brisbane, Queensland, Australia
- * E-mail:
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Xu Z, Bambrick H, Yakob L, Devine G, Lu J, Frentiu FD, Yang W, Williams G, Hu W. Spatiotemporal patterns and climatic drivers of severe dengue in Thailand. Sci Total Environ 2019; 656:889-901. [PMID: 30625675 DOI: 10.1016/j.scitotenv.2018.11.395] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 11/26/2018] [Accepted: 11/26/2018] [Indexed: 06/09/2023]
Abstract
OBJECTIVES The burden of dengue fever in Thailand is considerable, yet there are few large-scale studies exploring the drivers of transmission. This study aimed to investigate the spatiotemporal patterns and climatic drivers of severe dengue in Thailand. METHODS Geographic Information System (GIS) techniques and spatial cluster analysis were used to visualize the spatial distribution and detect high-risk clusters of severe dengue in 76 provinces of Thailand from January 1999 to December 2014. The seasonal patterns of severe dengue cases in different provinces were identified. A two-stage modelling approach combining a generalized linear model with a distributed lag non-linear model was used to quantify the effects of monthly mean temperature and relative humidity on the occurrence of severe dengue cases in 51 provinces of Thailand. RESULTS Significant severe dengue clustering was detected, especially during epidemic years, and the location of these clusters showed substantial inter-annual variation. Severe dengue cases in Northern and Northeastern Thailand peaked in June to August and this pattern was stable across the study period, whereas the seasonality of severe dengue cases in other regions (especially Central Thailand) was less predictable. The risk of the occurrence of severe dengue cases increased with an increase in mean temperature in Northeastern Thailand, Central Thailand, and Southern Thailand, with peaks occurring between 24 °C to 30 °C in Northeastern Thailand and 27 °C to 29 °C in Southern Thailand West Coast, respectively. Relative humidity significantly affected the occurrence of severe dengue cases in Northeastern and Central Thailand, with optimal ranges observed for each region. CONCLUSIONS Our findings substantiate the potential for developing climate-based dengue early warning systems for Thailand, and have implications for informing pre-emptive vector control.
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Affiliation(s)
- Zhiwei Xu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia; Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia; Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, UK
| | - Gregor Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Jiahai Lu
- School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Francesca D Frentiu
- Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia; School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Weizhong Yang
- Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Gail Williams
- School of Public Health, University of Queensland, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia; Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.
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Faddy HM, Gorman EC, Hoad VC, Frentiu FD, Tozer S, Flower RLP. Seroprevalence of antibodies to primate erythroparvovirus 1 (B19V) in Australia. BMC Infect Dis 2018; 18:631. [PMID: 30526514 PMCID: PMC6286569 DOI: 10.1186/s12879-018-3525-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 11/19/2018] [Indexed: 02/02/2023] Open
Abstract
Backgroud Primate erythroparvovirus 1 (B19V) is a globally ubiquitous DNA virus. Infection results in a variety of clinical presentations including erythema infectiosum in children and arthralgia in adults. There is limited understanding of the seroprevalence of B19V antibodies in the Australian population and therefore of population-wide immunity. This study aimed to investigate the seroprevalence of B19V antibodies in an Australian blood donor cohort, along with a cohort from a paediatric population. Methods Age/sex/geographical location stratified plasma samples (n = 2221) were collected from Australian blood donors. Samples were also sourced from paediatric patients (n = 223) in Queensland. All samples were screened for B19V IgG using an indirect- enzyme-linked immunosorbent assay. Results Overall, 57.90% (95% CI: 55.94%–59.85%) of samples tested positive for B19V IgG, with the national age-standardized seroprevalence of B19V exposure in Australians aged 0 to 79 years estimated to be 54.41%. Increasing age (p < 0.001) and state of residence (p < 0.001) were independently associated with B19V exposure in blood donors, with the highest rates in donors from Tasmania (71.88%, 95% CI: 66.95%–76.80%) and donors aged 65–80 years (78.41%, 95% CI: 74.11%–82.71%). A seroprevalence of 52.04% (95% CI: 47.92%–56.15%) was reported in women of child-bearing age (16 to 44 years). Sex was not associated with exposure in blood donors (p = 0.547) or in children (p = 0.261) screened in this study. Conclusions This study highlights a clear association between B19V exposure and increasing age, with over half of the Australian population likely to be immune to this virus. Differences in seroprevalence were also observed in donors residing in different states, with a higher prevalence reported in those from the southern states. The finding is consistent with previous studies, with higher rates observed in countries with a higher latitude. This study provides much needed insight into the prevalence of B19V exposure in the Australian population, which has implications for public health as well as transfusion and transplantation safety in Australia.
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Affiliation(s)
- Helen M Faddy
- Research and Development, Australian Red Cross Blood Service, Brisbane, Queensland, Australia. .,School of Biomedical Sciences, and Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia.
| | - Elise C Gorman
- Research and Development, Australian Red Cross Blood Service, Brisbane, Queensland, Australia.,School of Biomedical Sciences, and Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Veronica C Hoad
- Clinical Services and Research, Australian Red Cross Blood Service, Perth, Western Australia, Australia
| | - Francesca D Frentiu
- School of Biomedical Sciences, and Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Sarah Tozer
- Queensland Paediatric Infectious Diseases Laboratory, Centre for Children's Health Research, Brisbane, Queensland, Australia
| | - R L P Flower
- Research and Development, Australian Red Cross Blood Service, Brisbane, Queensland, Australia.,School of Biomedical Sciences, and Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
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Ciocchetta S, Prow NA, Darbro JM, Frentiu FD, Savino S, Montarsi F, Capelli G, Aaskov JG, Devine GJ. The new European invader Aedes (Finlaya) koreicus: a potential vector of chikungunya virus. Pathog Glob Health 2018; 112:107-114. [PMID: 29737236 PMCID: PMC6056824 DOI: 10.1080/20477724.2018.1464780] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Arthropod-borne disease outbreaks, facilitated by the introduction of exotic mosquitoes, pose a significant public health threat. Recent chikungunya virus (CHIKV) epidemics in Europe highlight the importance of understanding the vector potential of invading mosquitoes. In this paper we explore the potential of Aedes koreicus, a mosquito new to Europe, to transmit CHIKV. Mosquitoes were challenged with CHIKV and maintained at two temperatures: 23 °C and a fluctuating temperature. Total CHIKV infection rates at 3, 10 and 14 days post-feeding were low for both temperature treatments (13.8% at 23 °C; 6.2% at fluctuating T). A low percentage (6.1%, n = 65) of mosquitoes maintained at a constant 23 °C showed dissemination of the virus to the wings and legs. Infection of mosquito saliva, with live virus, occurred in 2 mosquitoes. No dissemination was noted under the fluctuating temperature regime. Based on these results we conclude that CHIKV transmission by this species is possible.
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Affiliation(s)
- Silvia Ciocchetta
- QIMR Berghofer Medical Research Institute, Royal Brisbane Hospital, Brisbane, Australia
- Institute for Health and Biomedical Innovation, and School of Biomedical Science, Queensland University of Technology, Brisbane, Australia
| | - Natalie A. Prow
- QIMR Berghofer Medical Research Institute, Royal Brisbane Hospital, Brisbane, Australia
| | - Jonathan M. Darbro
- QIMR Berghofer Medical Research Institute, Royal Brisbane Hospital, Brisbane, Australia
| | - Francesca D. Frentiu
- Institute for Health and Biomedical Innovation, and School of Biomedical Science, Queensland University of Technology, Brisbane, Australia
| | - Sandro Savino
- Geographic Information Systems, Department of Information Engineering, University of Padua, Padua, Italy
| | | | - Gioia Capelli
- Istituto Zooprofilattico Sperimentale delle Venezie, Padua, Italy
| | - John G. Aaskov
- Institute for Health and Biomedical Innovation, and School of Biomedical Science, Queensland University of Technology, Brisbane, Australia
| | - Gregor J. Devine
- QIMR Berghofer Medical Research Institute, Royal Brisbane Hospital, Brisbane, Australia
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Stassen L, Armitage CW, van der Heide DJ, Beagley KW, Frentiu FD. Zika Virus in the Male Reproductive Tract. Viruses 2018; 10:v10040198. [PMID: 29659541 PMCID: PMC5923492 DOI: 10.3390/v10040198] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 04/11/2018] [Accepted: 04/13/2018] [Indexed: 01/07/2023] Open
Abstract
Arthropod-borne viruses (arboviruses) are resurging across the globe. Zika virus (ZIKV) has caused significant concern in recent years because it can lead to congenital malformations in babies and Guillain-Barré syndrome in adults. Unlike other arboviruses, ZIKV can be sexually transmitted and may persist in the male reproductive tract. There is limited information regarding the impact of ZIKV on male reproductive health and fertility. Understanding the mechanisms that underlie persistent ZIKV infections in men is critical to developing effective vaccines and therapies. Mouse and macaque models have begun to unravel the pathogenesis of ZIKV infection in the male reproductive tract, with the testes and prostate gland implicated as potential reservoirs for persistent ZIKV infection. Here, we summarize current knowledge regarding the pathogenesis of ZIKV in the male reproductive tract, the development of animal models to study ZIKV infection at this site, and prospects for vaccines and therapeutics against persistent ZIKV infection.
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Affiliation(s)
- Liesel Stassen
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Queensland University of Technology, Brisbane 4006, Queensland, Australia.
| | - Charles W Armitage
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Queensland University of Technology, Brisbane 4006, Queensland, Australia.
| | - David J van der Heide
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Queensland University of Technology, Brisbane 4006, Queensland, Australia.
| | - Kenneth W Beagley
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Queensland University of Technology, Brisbane 4006, Queensland, Australia.
| | - Francesca D Frentiu
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Queensland University of Technology, Brisbane 4006, Queensland, Australia.
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Wee BA, Thomas M, Sweeney EL, Frentiu FD, Samios M, Ravel J, Gajer P, Myers G, Timms P, Allan JA, Huston WM. A retrospective pilot study to determine whether the reproductive tract microbiota differs between women with a history of infertility and fertile women. Aust N Z J Obstet Gynaecol 2017; 58:341-348. [DOI: 10.1111/ajo.12754] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 11/03/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Bryan A. Wee
- Institute of Health and Biomedical Innovation; Queensland University of Technology; Brisbane Qld Australia
| | - Mark Thomas
- School of Life Sciences; Faculty of Science; University of Technology Sydney; Sydney NSW Australia
| | - Emma Louise Sweeney
- Institute of Health and Biomedical Innovation; Queensland University of Technology; Brisbane Qld Australia
| | - Francesca D. Frentiu
- Institute of Health and Biomedical Innovation; Queensland University of Technology; Brisbane Qld Australia
| | - Melanie Samios
- School of Medicine; Griffith University and UC Health Clinical School; The Wesley Hospital; Brisbane Qld Australia
| | - Jacques Ravel
- Institute for Genome Sciences; University of Maryland School of Medicine; Baltimore Maryland USA
| | - Pawel Gajer
- Institute for Genome Sciences; University of Maryland School of Medicine; Baltimore Maryland USA
| | - Garry Myers
- ithree institute; University of Technology Sydney; Sydney NSW Australia
| | - Peter Timms
- Faculty of Science; Health, Education and Engineering; University of the Sunshine Coast; Qld Australia
| | - John A. Allan
- UC Health Clinical School; The Wesley Hospital; Brisbane Qld Australia
- Wesley Medical Research; The Wesley Hospital; Brisbane Qld Australia
| | - Wilhelmina M. Huston
- Institute of Health and Biomedical Innovation; Queensland University of Technology; Brisbane Qld Australia
- School of Life Sciences; Faculty of Science; University of Technology Sydney; Sydney NSW Australia
- Wesley Medical Research; The Wesley Hospital; Brisbane Qld Australia
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Abstract
Mosquito-borne viruses are major human pathogens. Introducing Wolbachia into mosquitoes could reduce disease burdens because these bacteria block virus transmission. How Wolbachia does this is unclear, but new data show that modulation of host-cell lipids is critical.
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Affiliation(s)
- Francesca D Frentiu
- School of Biomedical Sciences and Institute for Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.
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Rohrscheib CE, Frentiu FD, Horn E, Ritchie FK, van Swinderen B, Weible MW, O’Neill SL, Brownlie JC. Response to: Comment on Rohrscheib et al. 2016 "Intensity of mutualism breakdown is determined by temperature not amplification of Wolbachia genes". PLoS Pathog 2017; 13:e1006521. [PMID: 28892518 PMCID: PMC5593257 DOI: 10.1371/journal.ppat.1006521] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 07/10/2017] [Indexed: 11/19/2022] Open
Affiliation(s)
- Chelsie E. Rohrscheib
- School of Natural Sciences, Griffith University, Nathan, Australia
- Griffith Research Institute for Drug Discovery, Griffith University, Nathan, Australia
| | - Francesca D. Frentiu
- Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Australia
| | - Emilie Horn
- School of Natural Sciences, Griffith University, Nathan, Australia
| | - Fiona K. Ritchie
- School of Natural Sciences, Griffith University, Nathan, Australia
| | - Bruno van Swinderen
- Queensland Brain Institute, The University of Queensland, St. Lucia, Australia
| | - Michael W. Weible
- School of Natural Sciences, Griffith University, Nathan, Australia
- Griffith Research Institute for Drug Discovery, Griffith University, Nathan, Australia
| | - Scott L. O’Neill
- School of Biological Sciences, Monash University, Clayton, VIC, Australia
| | - Jeremy C. Brownlie
- School of Natural Sciences, Griffith University, Nathan, Australia
- Environmental Futures Research Institute, Griffith University, Nathan, Australia
- * E-mail:
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Ciocchetta S, Darbro JM, Frentiu FD, Montarsi F, Capelli G, Aaskov JG, Devine GJ. Laboratory colonization of the European invasive mosquito Aedes (Finlaya) koreicus. Parasit Vectors 2017; 10:74. [PMID: 28183328 PMCID: PMC5301451 DOI: 10.1186/s13071-017-2010-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 02/01/2017] [Indexed: 11/13/2022] Open
Abstract
Background Aedes (Finlaya) koreicus (Edwards) is a mosquito that has recently entered Europe from Asia. This species is considered a potential threat to newly colonized territories, but little is known about its capacity to transmit pathogens or ability to compete with native mosquito species. The establishment of a laboratory colony is a necessary first step for further laboratory studies on the biology, ecology and vector competence of Ae. koreicus. Results A self-mating colony was established at QIMR Berghofer Medical Research Institute (Brisbane, Australia) from eggs of the F1 progeny of individuals collected as free-living larvae in northeastern Italy (Belluno province). Mosquitoes are currently maintained on both defibrinated sheep blood provided via an artificial membrane system and human blood from volunteers. Larvae are maintained in rain water and fed with Tetramin® fish food (©2015 Spectrum Brands - Pet, Home and Garden Division, Tetra-Fish). Morphometric measurements related to body size were taken and a fecundity index, based on wing length, was calculated. An in vivo technique for differentiating male and female pupae has been optimized. Our findings provide the basis for further studies on the ecology and physiology of Ae. koreicus. Conclusion We describe the establishment of an Ae. koreicus colony in the laboratory and identify critical requirements for the maintenance of this mosquito species under artificial conditions. The laboratory colony will facilitate studies investigating the vector potential of this species for human pathogens.
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Affiliation(s)
- Silvia Ciocchetta
- QIMR Berghofer Medical Research Institute, Royal Brisbane Hospital, Brisbane, Australia. .,Queensland University of Technology, Brisbane, Australia.
| | - Jonathan M Darbro
- QIMR Berghofer Medical Research Institute, Royal Brisbane Hospital, Brisbane, Australia
| | | | | | - Gioia Capelli
- Istituto Zooprofilattico Sperimentale delle Venezie, Padova, Italy
| | - John G Aaskov
- Queensland University of Technology, Brisbane, Australia
| | - Gregor J Devine
- QIMR Berghofer Medical Research Institute, Royal Brisbane Hospital, Brisbane, Australia
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Gorman EC, Flower RL, Hoad VC, Frentiu FD, Faddy HM. Seroprevalence of antibodies to primate erythroparvovirus 1 among Australian blood donors. Pathology 2017. [DOI: 10.1016/j.pathol.2016.12.338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Viennet E, Mincham G, Frentiu FD, Jansen CC, Montgomery BL, Harley D, Flower RLP, Williams CR, Faddy HM. Epidemic Potential for Local Transmission of Zika Virus in 2015 and 2016 in Queensland, Australia. PLoS Curr 2016; 8. [PMID: 28123859 PMCID: PMC5222544 DOI: 10.1371/currents.outbreaks.73d82b08998c6d729c41ef6cdcc80176] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Zika virus could be transmitted in the state of Queensland, Australia, in parts of the state where the mosquito vectors are established. METHODS We assessed the epidemic potential of Zika in Queensland from January 2015 to August 2016, and estimate the epidemic potential from September to December 2016, by calculating the temperature-dependent relative vectorial capacity (rVc), based on empirical and estimated parameters. RESULTS Through 2015, we estimated a rVc of 0.119, 0.152, 0.170, and 0.175, respectively in the major cities of Brisbane, Rockhampton, Cairns, and Townsville. From January to August 2016, the epidemic potential trend was similar to 2015, however the highest epidemic potential was in Cairns. During September to November 2016, the epidemic potential is consistently the highest in Cairns, followed by Townsville, Rockhampton and Brisbane. Then, from November to December 2016, Townsville has the highest estimated epidemic potential. DISCUSSION We demonstrate using a vectorial capacity model that ZIKV could have been locally transmitted in Queensland, Australia during 2015 and 2016. ZIKV remains a threat to Australia for the upcoming summer, during the Brazilian Carnival season, when the abundance of vectors is relatively high. Understanding the epidemic potential of local ZIKV transmission will allow better management of threats to blood safety and assessment of public health risk.
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Affiliation(s)
- Elvina Viennet
- Research and Development, Australian Red Cross Blood Service, Kelvin Grove, Queensland, Australia
| | - Gina Mincham
- Centre for Population Health Research, University of South Australia, Adelaide, South Australia, Australia
| | - Francesca D Frentiu
- Institute of Health and Biomedical Innovation & School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
| | - Cassie C Jansen
- Metro North Public Health Unit, Metro North Hospital and Health Service, Windsor, Queensland, Australia
| | - Brian L Montgomery
- Metro South Public Health Unit, Metro South Hospital and Health Service, Brisbane, Queensland, Australia
| | - David Harley
- Research School of Population Health, The Australian National University, Australian Capital Territory, Australia
| | - Robert L P Flower
- Research and Development, Australian Red Cross Blood Service, Kelvin Grove, Queensland, Australia
| | - Craig R Williams
- Centre for Population Health Research, University of South Australia, Adelaide, South Australia, Australia
| | - Helen M Faddy
- Research and Development, Australian Red Cross Blood Service, Kelvin Grove, Queensland, Australia
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Rohrscheib CE, Frentiu FD, Horn E, Ritchie FK, van Swinderen B, Weible MW, O’Neill SL, Brownlie JC. Intensity of Mutualism Breakdown Is Determined by Temperature Not Amplification of Wolbachia Genes. PLoS Pathog 2016; 12:e1005888. [PMID: 27661080 PMCID: PMC5035075 DOI: 10.1371/journal.ppat.1005888] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 08/22/2016] [Indexed: 11/18/2022] Open
Abstract
Wolbachia are maternally transmitted intracellular bacterial symbionts that infect approximately 40% of all insect species. Though several strains of Wolbachia naturally infect Drosophila melanogaster and provide resistance against viral pathogens, or provision metabolites during periods of nutritional stress, one virulent strain, wMelPop, reduces fly lifespan by half, possibly as a consequence of over-replication. While the mechanisms that allow wMelPop to over-replicate are still of debate, a unique tandem repeat locus in the wMelPop genome that contains eight genes, referred to as the “Octomom” locus has been identified and is thought to play an important regulatory role. Estimates of Octomom locus copy number correlated increasing copy number to both Wolbachia bacterial density and increased pathology. Here we demonstrate that infected fly pathology is not dependent on an increased Octomom copy number, but does strongly correlate with increasing temperature. When measured across developmental time, we also show Octomom copy number to be highly variable across developmental time within a single generation. Using a second pathogenic strain of Wolbachia, we further demonstrate reduced insect lifespan can occur independently of a high Octomom locus copy number. Taken together, this data demonstrates that the mechanism/s of wMelPop virulence is more complex than has been previously described. Wolbachia are obligate intracellular, symbiotic bacteria that infect approximately 40% of insect species, as well as filarial nematodes, arachnids and terrestrial isopods. While the vast majority of Wolbachia strains impose few fitness costs to their host, one strain wMelPop is unique as it lacks the ability to regulate its growth, and as consequence can reduce host lifespan by half. The strength of pathology induced by wMelPop has been linked to either increased bacterial density or copy number of an eight gene tandem repeat region referred to as the “Octomom” locus. To date no study has determined the effect changes to temperature have on Octomom copy number or bacterial density. Here we demonstrate that while the Octomom locus is unstable within a single generation of its host, changes to Octomom copy number did not occur in response to temperature. Furthermore, Octomom copy number or bacterial density does not correlate to the strength of pathology. These results indicate that the underpinning genetics of pathology are unclear, and the mechanisms by pathology is induced are more complex than previously realised.
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Affiliation(s)
- Chelsie E. Rohrscheib
- School of Natural Sciences, Griffith University, Nathan, Australia
- Eskitis Institute for Cell and Molecular Therapies, Griffith University, Nathan, Australia
| | - Francesca D. Frentiu
- Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Australia
| | - Emilie Horn
- School of Natural Sciences, Griffith University, Nathan, Australia
| | - Fiona K. Ritchie
- School of Natural Sciences, Griffith University, Nathan, Australia
| | - Bruno van Swinderen
- Queensland Brain Institute, The University of Queensland, St. Lucia, Australia
| | - Michael W. Weible
- School of Natural Sciences, Griffith University, Nathan, Australia
- Eskitis Institute for Cell and Molecular Therapies, Griffith University, Nathan, Australia
| | - Scott L. O’Neill
- School of Biological Sciences, Monash University, Clayton, Australia
| | - Jeremy C. Brownlie
- School of Natural Sciences, Griffith University, Nathan, Australia
- Environmental Futures Research Institute, Griffith University, Nathan, Australia
- * E-mail:
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40
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Ye YH, Chenoweth SF, Carrasco AM, Allen SL, Frentiu FD, van den Hurk AF, Beebe NW, McGraw EA. Evolutionary potential of the extrinsic incubation period of dengue virus in Aedes aegypti. Evolution 2016; 70:2459-2469. [PMID: 27530960 DOI: 10.1111/evo.13039] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 07/19/2016] [Accepted: 08/05/2016] [Indexed: 01/17/2023]
Abstract
Dengue fever is the most common arboviral disease worldwide. It is caused by dengue viruses (DENV) and the mosquito Aedes aegypti is its primary vector. One of the most powerful determinants of a mosquito's ability to transmit DENV is the length of the extrinsic incubation period (EIP), the time it takes for a virus to be transmitted by a mosquito after consuming an infected blood meal. Here, we repeatedly measured DENV load in the saliva of individual mosquitoes over their lifetime and used this in combination with a breeding design to determine the extent to which EIP might respond to the evolutionary forces of drift and selection. We demonstrated that genetic variation among mosquitoes contributes significantly to transmission potential and length of EIP. We reveal that shorter EIP is genetically correlated with reduced mosquito lifespan, highlighting negative life-history consequences for virus-infected mosquitoes. This work highlights the capacity for local genetic variation in mosquito populations to evolve and to dramatically affect the nature of human outbreaks. It also provides the impetus for isolating mosquito genes that determine EIP. More broadly, our dual experimental approach offers new opportunities for studying the evolutionary potential of transmission traits in other vector/pathogen systems.
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Affiliation(s)
- Yixin H Ye
- School of Biological Sciences, Monash University, Clayton, VIC, 3800, Australia
| | - Stephen F Chenoweth
- School of Biological Sciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Alison M Carrasco
- School of Biological Sciences, Monash University, Clayton, VIC, 3800, Australia
| | - Scott L Allen
- School of Biological Sciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Francesca D Frentiu
- Institute for Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, QLD, 4059, Australia
| | - Andrew F van den Hurk
- Public Health Virology, Communicable Diseases Unit, Queensland Health and Forensic and Scientific Services, Coopers Plains, QLD, 4108, Australia
| | - Nigel W Beebe
- School of Biological Sciences, The University of Queensland, St. Lucia, QLD, 4072, Australia.,CSIRO Biosecurity Flagship, Ecosciences Precinct, Dutton Park, QLD, 4102, Australia
| | - Elizabeth A McGraw
- School of Biological Sciences, Monash University, Clayton, VIC, 3800, Australia.
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41
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Furuya-Kanamori L, Liang S, Milinovich G, Magalhaes RJS, Clements ACA, Hu W, Brasil P, Frentiu FD, Dunning R, Yakob L. Erratum to: Co-distribution and co-infection of chikungunya and dengue viruses. BMC Infect Dis 2016; 16:188. [PMID: 27129475 PMCID: PMC4851825 DOI: 10.1186/s12879-016-1519-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Luis Furuya-Kanamori
- Research School of Population Health, Australian National University, Acton, ACT, 2601, Australia.
| | - Shaohong Liang
- Environmental Health Institute, National Environment Agency, Singapore, 138667, Singapore
| | - Gabriel Milinovich
- School of Public Health and Social Work, Queensland University of Technology, Kelvin Grove, QLD, 4059, Australia
| | - Ricardo J Soares Magalhaes
- School of Veterinary Science, University of Queensland, Gatton, QLD, 4343, Australia.,UQ Children's Health Research Centre, University of Queensland, South Brisbane, QLD, 4101, Australia
| | - Archie C A Clements
- Research School of Population Health, Australian National University, Acton, ACT, 2601, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Kelvin Grove, QLD, 4059, Australia
| | - Patricia Brasil
- Instituto Nacional de Infectologia Evandro Chagas/Fiocruz, Rio de Janeiro, Brazil
| | - Francesca D Frentiu
- School of Biomedical Sciences and Institute for Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, QLD, 4059, Australia
| | - Rebecca Dunning
- Formerly School of Biomedical Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK.
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Furuya-Kanamori L, Liang S, Milinovich G, Soares Magalhaes RJ, Clements ACA, Hu W, Brasil P, Frentiu FD, Dunning R, Yakob L. Co-distribution and co-infection of chikungunya and dengue viruses. BMC Infect Dis 2016; 16:84. [PMID: 26936191 PMCID: PMC4776349 DOI: 10.1186/s12879-016-1417-2] [Citation(s) in RCA: 143] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 02/07/2016] [Indexed: 01/08/2023] Open
Abstract
Background Chikungunya and dengue infections are spatio-temporally related. The current review aims to determine the geographic limits of chikungunya, dengue and the principal mosquito vectors for both viruses and to synthesise current epidemiological understanding of their co-distribution. Methods Three biomedical databases (PubMed, Scopus and Web of Science) were searched from their inception until May 2015 for studies that reported concurrent detection of chikungunya and dengue viruses in the same patient. Additionally, data from WHO, CDC and Healthmap alerts were extracted to create up-to-date global distribution maps for both dengue and chikungunya. Results Evidence for chikungunya-dengue co-infection has been found in Angola, Gabon, India, Madagascar, Malaysia, Myanmar, Nigeria, Saint Martin, Singapore, Sri Lanka, Tanzania, Thailand and Yemen; these constitute only 13 out of the 98 countries/territories where both chikungunya and dengue epidemic/endemic transmission have been reported. Conclusions Understanding the true extent of chikungunya-dengue co-infection is hampered by current diagnosis largely based on their similar symptoms. Heightened awareness of chikungunya among the public and public health practitioners in the advent of the ongoing outbreak in the Americas can be expected to improve diagnostic rigour. Maps generated from the newly compiled lists of the geographic distribution of both pathogens and vectors represent the current geographical limits of chikungunya and dengue, as well as the countries/territories at risk of future incursion by both viruses. These describe regions of co-endemicity in which lab-based diagnosis of suspected cases is of higher priority. Electronic supplementary material The online version of this article (doi:10.1186/s12879-016-1417-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Luis Furuya-Kanamori
- Research School of Population Health, Australian National University, Acton, ACT 2601, Australia.
| | - Shaohong Liang
- Environmental Health Institute, National Environment Agency, Singapore, 138667, Singapore.
| | - Gabriel Milinovich
- School of Public Health and Social Work, Queensland University of Technology, Kelvin Grove, QLD, 4059, Australia.
| | - Ricardo J Soares Magalhaes
- School of Veterinary Science, University of Queensland, Gatton, QLD, 4343, Australia. .,UQ Children's Health Research Centre, University of Queensland, South Brisbane, QLD, 4101, Australia.
| | - Archie C A Clements
- Research School of Population Health, Australian National University, Acton, ACT 2601, Australia.
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Kelvin Grove, QLD, 4059, Australia.
| | - Patricia Brasil
- Instituto Nacional de Infectologia Evandro Chagas/ Fiocruz, Rio de Janeiro, Brazil.
| | - Francesca D Frentiu
- School of Biomedical Sciences and Institute for Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, QLD, 4059, Australia.
| | - Rebecca Dunning
- Formerly School of Biomedical Sciences, University of Queensland, St Lucia, QLD, 4072, Australia.
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK.
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Skelton E, Rancès E, Frentiu FD, Kusmintarsih ES, Iturbe-Ormaetxe I, Caragata EP, Woolfit M, O’Neill SL. A Native Wolbachia Endosymbiont Does Not Limit Dengue Virus Infection in the Mosquito Aedes notoscriptus (Diptera: Culicidae). J Med Entomol 2016; 53:401-8. [PMID: 26721865 PMCID: PMC5853675 DOI: 10.1093/jme/tjv235] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The endosymbiotic bacterium Wolbachia pipientis infects many species of insects and has been transinfected into the mosquito Aedes aegypti (L.), the primary vector of dengue virus (DENV). Recently, it has been shown that Wolbachia blocks the replication and transmission of RNA viruses, such as DENV, in a number of mosquito species including Ae. aegypti and Aedes albopictus (Skuse), which is naturally infected with Wolbachia and considered a secondary vector for DENV. The mosquito species Aedes notoscriptus (Skuse) is highly prevalent in Australia, including in areas where DENV outbreaks have been recorded. The mosquito has been implicated in the transmission of Ross River and Barmah Forest viruses, but not DENV. We investigated whether Wolbachia naturally infects this mosquito species and whether it has an impact on the ability of Ae. notoscriptus to transmit DENV. We show, for the first time, that Ae. notoscriptus is naturally infected with a strain of Wolbachia that belongs to supergroup B and is localized only in the ovaries. However, Wolbachia infection in Ae. notoscriptus did not induce resistance to DENV and had no effect on overall DENV infection rate or titer. The presence of a native Wolbachia in Ae. notoscriptus cannot explain why this mosquito is an ineffective vector of DENV.
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Affiliation(s)
- Ellie Skelton
- School of Biological Sciences, The University of Queensland, QLD 4072, Australia (
,
,
,
,
,
,
)
- School of Medicine, Deakin University, Geelong, VIC 3216, Australia (
)
| | - Edwige Rancès
- School of Biological Sciences, The University of Queensland, QLD 4072, Australia (
,
,
,
,
,
,
)
- School of Biological Sciences, Monash University, VIC 3800, Australia (
,
,
,
,
)
| | - Francesca D. Frentiu
- School of Biological Sciences, The University of Queensland, QLD 4072, Australia (
,
,
,
,
,
,
)
- School of Biomedical Sciences and Institute for Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, QLD 4059, Australia (
)
| | | | - Iñaki Iturbe-Ormaetxe
- School of Biological Sciences, The University of Queensland, QLD 4072, Australia (
,
,
,
,
,
,
)
- School of Biological Sciences, Monash University, VIC 3800, Australia (
,
,
,
,
)
| | - Eric P. Caragata
- School of Biological Sciences, The University of Queensland, QLD 4072, Australia (
,
,
,
,
,
,
)
- School of Biological Sciences, Monash University, VIC 3800, Australia (
,
,
,
,
)
- FIOCRUZ/ Centro de Pesquisas René Rachou, Belo Horizonte – MG Brazil CEP 30190-002 (
), and
| | - Megan Woolfit
- School of Biological Sciences, The University of Queensland, QLD 4072, Australia (
,
,
,
,
,
,
)
- School of Biological Sciences, Monash University, VIC 3800, Australia (
,
,
,
,
)
| | - Scott L. O’Neill
- School of Biological Sciences, The University of Queensland, QLD 4072, Australia (
,
,
,
,
,
,
)
- School of Biological Sciences, Monash University, VIC 3800, Australia (
,
,
,
,
)
- Corresponding author, e-mail:
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44
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Ye YH, Carrasco AM, Frentiu FD, Chenoweth SF, Beebe NW, van den Hurk AF, Simmons CP, O’Neill SL, McGraw EA. Wolbachia Reduces the Transmission Potential of Dengue-Infected Aedes aegypti. PLoS Negl Trop Dis 2015; 9:e0003894. [PMID: 26115104 PMCID: PMC4482661 DOI: 10.1371/journal.pntd.0003894] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 06/09/2015] [Indexed: 12/03/2022] Open
Abstract
Background Dengue viruses (DENV) are the causative agents of dengue, the world’s most prevalent arthropod-borne disease with around 40% of the world’s population at risk of infection annually. Wolbachia pipientis, an obligate intracellular bacterium, is being developed as a biocontrol strategy against dengue because it limits replication of the virus in the mosquito. The Wolbachia strain wMel, which has been introduced into the mosquito vector, Aedes aegypti, has been shown to invade and spread to near fixation in field releases. Standard measures of Wolbachia’s efficacy for blocking virus replication focus on the detection and quantification of virus in mosquito tissues. Examining the saliva provides a more accurate measure of transmission potential and can reveal the extrinsic incubation period (EIP), that is, the time it takes virus to arrive in the saliva following the consumption of DENV viremic blood. EIP is a key determinant of a mosquito’s ability to transmit DENVs, as the earlier the virus appears in the saliva the more opportunities the mosquito will have to infect humans on subsequent bites. Methodology/Principal Findings We used a non-destructive assay to repeatedly quantify DENV in saliva from wMel-infected and Wolbachia-free wild-type control mosquitoes following the consumption of a DENV-infected blood meal. We show that wMel lengthens the EIP, reduces the frequency at which the virus is expectorated and decreases the dengue copy number in mosquito saliva as compared to wild-type mosquitoes. These observations can at least be partially explained by an overall reduction in saliva produced by wMel mosquitoes. More generally, we found that the concentration of DENV in a blood meal is a determinant of the length of EIP, saliva virus titer and mosquito survival. Conclusions/Significance The saliva-based traits reported here offer more disease-relevant measures of Wolbachia’s effects on the vector and the virus. The lengthening of EIP highlights another means, in addition to the reduction of infection frequencies and DENV titers in mosquitoes, by which Wolbachia should operate to reduce DENV transmission in the field. Dengue is endemic in more than 100 countries and is transmitted by the mosquito Aedes aegypti. The use of the symbiotic bacterium Wolbachia has become a potential biocontrol approach against dengue virus for two reasons. First, Wolbachia spreads rapidly through populations by manipulating host reproduction to its advantage. Second, Wolbachia limits viral replication in the mosquito by competing with the virus for essential host resources. Following field release in Cairns, Australia in 2011, the wMel strain of Wolbachia has successfully invaded wild mosquito populations, infecting nearly all individuals. To test whether limited dengue replication in wMel mosquitoes translates to a reduction in dengue transmission potential, we used a non-destructive assay to repeatedly quantify dengue virus in mosquito saliva. We found that wMel significantly delayed the time it took for mosquito saliva to become infectious, reduced the frequency of dengue virus that was expectorated by mosquitoes and lowered the virus titer in mosquito saliva. We also showed that wMel infection suppresses saliva production in mosquitoes that may, in part, explain our findings. The saliva-based nature of the work provides a more accurate assessment of Wolbachia’s ability to limit disease transmission and suggests that Wolbachia may have positive impacts on transmission not only by reducing the number of infectious mosquitoes in a population but also delaying the arrival of virus in the saliva.
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Affiliation(s)
- Yixin H. Ye
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
| | - Alison M. Carrasco
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
| | - Francesca D. Frentiu
- Institute for Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland, Australia
| | - Stephen F. Chenoweth
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
| | - Nigel W. Beebe
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
- CSIRO Biosecurity Flagship, Ecosciences Precinct, Dutton Park, Queensland, Australia
| | - Andrew F. van den Hurk
- Virology, Public and Environmental Health, Forensic and Scientific Services, Department of Health, Queensland Government, Coopers Plains, Queensland, Australia
| | - Cameron P. Simmons
- Nossal Institute of Global Health, University of Melbourne, Parkville, Victoria, Australia
- Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
- Centre for Tropical Medicine, University of Oxford, Churchill Hospital, Oxford, United Kingdom
| | - Scott L. O’Neill
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
| | - Elizabeth A. McGraw
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
- * E-mail:
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45
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Ivory-Church J, Frentiu FD, Chenoweth SF. Polymorphisms in a desaturase 2 ortholog associate with cuticular hydrocarbon and male mating success variation in a natural population of Drosophila serrata. J Evol Biol 2015; 28:1600-9. [PMID: 26104145 DOI: 10.1111/jeb.12679] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 06/07/2015] [Indexed: 01/22/2023]
Abstract
Elucidating the nature of genetic variation underlying both sexually selected traits and the fitness components of sexual selection is essential to understanding the broader consequences of sexual selection as an evolutionary process. To date, there have been relatively few attempts to connect the genetic variance in sexually selected traits with segregating DNA sequence polymorphisms. We set out to address this in a well-characterized sexual selection system--the cuticular hydrocarbons (CHCs) of Drosophila serrata--using an indirect association study design that allowed simultaneous estimation of the genetic variance in CHCs, sexual fitness and single nucleotide polymorphism (SNP) effects in an outbred population. We cloned and sequenced an ortholog of the D. melanogaster desaturase 2 gene, previously shown to affect CHC biosynthesis in D. melanogaster, and associated 36 SNPs with minor allele frequencies > 0.02 with variance in CHCs and sexual fitness. Three SNPs had significant multivariate associations with CHC phenotype (q-value < 0.05). At these loci, minor alleles had multivariate effects on CHCs that were weakly associated with the multivariate direction of sexual selection operating on these traits. Two of these SNPs had pleiotropic associations with male mating success, suggesting these variants may underlie responses to sexual selection due to this locus. There were 15 significant male mating success associations (q-value < 0.1), and interestingly, we detected a nonrandom pattern in the relationship between allele frequency and direction of effect on male mating success. The minor-frequency allele usually reduced male mating success, suggesting a positive association between male mating success and total fitness at this locus.
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Affiliation(s)
- J Ivory-Church
- School of Biological Sciences, The University of Queensland, St. Lucia, Qld, Australia
| | - F D Frentiu
- School of Biological Sciences, The University of Queensland, St. Lucia, Qld, Australia.,Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Qld, Australia
| | - S F Chenoweth
- School of Biological Sciences, The University of Queensland, St. Lucia, Qld, Australia
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46
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van den Hurk AF, Hall-Mendelin S, Webb CE, Tan CSE, Frentiu FD, Prow NA, Hall RA. Role of enhanced vector transmission of a new West Nile virus strain in an outbreak of equine disease in Australia in 2011. Parasit Vectors 2014; 7:586. [PMID: 25499981 PMCID: PMC4280035 DOI: 10.1186/s13071-014-0586-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 12/02/2014] [Indexed: 11/18/2022] Open
Abstract
Background In 2011, a variant of West Nile virus Kunjin strain (WNVKUN) caused an unprecedented epidemic of neurological disease in horses in southeast Australia, resulting in almost 1,000 cases and a 9% fatality rate. We investigated whether increased fitness of the virus in the primary vector, Culex annulirostris, and another potential vector, Culex australicus, contributed to the widespread nature of the outbreak. Methods Mosquitoes were exposed to infectious blood meals containing either the virus strain responsible for the outbreak, designated WNVKUN2011, or WNVKUN2009, a strain of low virulence that is typical of historical strains of this virus. WNVKUN infection in mosquito samples was detected using a fixed cell culture enzyme immunoassay and a WNVKUN- specific monoclonal antibody. Probit analysis was used to determine mosquito susceptibility to infection. Infection, dissemination and transmission rates for selected days post-exposure were compared using Fisher’s exact test. Virus titers in bodies and saliva expectorates were compared using t-tests. Results There were few significant differences between the two virus strains in the susceptibility of Cx. annulirostris to infection, the kinetics of virus replication and the ability of this mosquito species to transmit either strain. Both strains were transmitted by Cx. annulirostris for the first time on day 5 post-exposure. The highest transmission rates (proportion of mosquitoes with virus detected in saliva) observed were 68% for WNVKUN2011 on day 12 and 72% for WNVKUN2009 on day 14. On days 12 and 14 post-exposure, significantly more WNVKUN2011 than WNVKUN2009 was expectorated by infected mosquitoes. Infection, dissemination and transmission rates of the two strains were not significantly different in Culex australicus. However, transmission rates and the amount of virus expectorated were significantly lower in Cx. australicus than Cx. annulirostris. Conclusions The higher amount of WNVKUN2011 expectorated by infected mosquitoes may be an indication that this virus strain is transmitted more efficiently by Cx. annulirostris compared to other WNVKUN strains. Combined with other factors, such as a convergence of abundant mosquito and wading bird populations, and mammalian and avian feeding behaviour by Cx. annulirostris, this may have contributed to the scale of the 2011 equine epidemic.
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Affiliation(s)
- Andrew F van den Hurk
- Virology, Public and Environmental Health, Forensic and Scientific Services, Department of Health, Queensland Government, Brisbane, QLD, Australia. .,Australian Infectious Disease Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD, Australia.
| | - Sonja Hall-Mendelin
- Virology, Public and Environmental Health, Forensic and Scientific Services, Department of Health, Queensland Government, Brisbane, QLD, Australia.
| | - Cameron E Webb
- Department of Medical Entomology, University of Sydney and Pathology West - ICPMR Westmead, Westmead, NSW, Australia.
| | - Cindy S E Tan
- Australian Infectious Disease Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD, Australia.
| | - Francesca D Frentiu
- Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, QLD, Australia.
| | - Natalie A Prow
- Australian Infectious Disease Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD, Australia.
| | - Roy A Hall
- Australian Infectious Disease Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD, Australia.
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47
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Frentiu FD, Yuan F, Savage WK, Bernard GD, Mullen SP, Briscoe AD. Opsin clines in butterflies suggest novel roles for insect photopigments. Mol Biol Evol 2014; 32:368-79. [PMID: 25371434 DOI: 10.1093/molbev/msu304] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Opsins are ancient molecules that enable animal vision by coupling to a vitamin-derived chromophore to form light-sensitive photopigments. The primary drivers of evolutionary diversification in opsins are thought to be visual tasks related to spectral sensitivity and color vision. Typically, only a few opsin amino acid sites affect photopigment spectral sensitivity. We show that opsin genes of the North American butterfly Limenitis arthemis have diversified along a latitudinal cline, consistent with natural selection due to environmental factors. We sequenced single nucleotide (SNP) polymorphisms in the coding regions of the ultraviolet (UVRh), blue (BRh), and long-wavelength (LWRh) opsin genes from ten butterfly populations along the eastern United States and found that a majority of opsin SNPs showed significant clinal variation. Outlier detection and analysis of molecular variance indicated that many SNPs are under balancing selection and show significant population structure. This contrasts with what we found by analysing SNPs in the wingless and EF-1 alpha loci, and from neutral amplified fragment length polymorphisms, which show no evidence of significant locus-specific or genome-wide structure among populations. Using a combination of functional genetic and physiological approaches, including expression in cell culture, transgenic Drosophila, UV-visible spectroscopy, and optophysiology, we show that key BRh opsin SNPs that vary clinally have almost no effect on spectral sensitivity. Our results suggest that opsin diversification in this butterfly is more consistent with natural selection unrelated to spectral tuning. Some of the clinally varying SNPs may instead play a role in regulating opsin gene expression levels or the thermostability of the opsin protein. Lastly, we discuss the possibility that insect opsins might have important, yet-to-be elucidated, adaptive functions in mediating animal responses to abiotic factors, such as temperature or photoperiod.
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Affiliation(s)
- Francesca D Frentiu
- Institute of Health and Biomedical Innovation, and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, QLD, Australia Department of Ecology and Evolutionary Biology, University of California, Irvine
| | - Furong Yuan
- Department of Ecology and Evolutionary Biology, University of California, Irvine
| | - Wesley K Savage
- Center for Ecology and Conservation Biology and Department of Biology, Boston University Department of Biological Sciences, University of Massachusetts, Lowell
| | - Gary D Bernard
- Department of Electrical Engineering, University of Washington, Seattle
| | - Sean P Mullen
- Center for Ecology and Conservation Biology and Department of Biology, Boston University
| | - Adriana D Briscoe
- Department of Ecology and Evolutionary Biology, University of California, Irvine
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Ye YH, Ng TS, Frentiu FD, Walker T, van den Hurk AF, O'Neill SL, Beebe NW, McGraw EA. Comparative susceptibility of mosquito populations in North Queensland, Australia to oral infection with dengue virus. Am J Trop Med Hyg 2014; 90:422-30. [PMID: 24420782 DOI: 10.4269/ajtmh.13-0186] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Dengue is the most prevalent arthropod-borne virus, with at least 40% of the world's population at risk of infection each year. In Australia, dengue is not endemic, but viremic travelers trigger outbreaks involving hundreds of cases. We compared the susceptibility of Aedes aegypti mosquitoes from two geographically isolated populations to two strains of dengue virus serotype 2. We found, interestingly, that mosquitoes from a city with no history of dengue were more susceptible to virus than mosquitoes from an outbreak-prone region, particularly with respect to one dengue strain. These findings suggest recent evolution of population-based differences in vector competence or different historical origins. Future genomic comparisons of these populations could reveal the genetic basis of vector competence and the relative role of selection and stochastic processes in shaping their differences. Lastly, we show the novel finding of a correlation between midgut dengue titer and titer in tissues colonized after dissemination.
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Affiliation(s)
- Yixin H Ye
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia; Institute for Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia; Public Health Virology, Forensic and Scientific Services, Department of Health, Coopers Plains, Queensland, Australia; School of Biological Sciences, University of Queensland, St. Lucia, Queensland, Australia
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van den Hurk AF, Hall-Mendelin S, Pyke AT, Frentiu FD, McElroy K, Day A, Higgs S, O'Neill SL. Impact of Wolbachia on infection with chikungunya and yellow fever viruses in the mosquito vector Aedes aegypti. PLoS Negl Trop Dis 2012; 6:e1892. [PMID: 23133693 PMCID: PMC3486898 DOI: 10.1371/journal.pntd.0001892] [Citation(s) in RCA: 278] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Accepted: 09/21/2012] [Indexed: 12/15/2022] Open
Abstract
Incidence of disease due to dengue (DENV), chikungunya (CHIKV) and yellow fever (YFV) viruses is increasing in many parts of the world. The viruses are primarily transmitted by Aedes aegypti, a highly domesticated mosquito species that is notoriously difficult to control. When transinfected into Ae. aegypti, the intracellular bacterium Wolbachia has recently been shown to inhibit replication of DENVs, CHIKV, malaria parasites and filarial nematodes, providing a potentially powerful biocontrol strategy for human pathogens. Because the extent of pathogen reduction can be influenced by the strain of bacterium, we examined whether the wMel strain of Wolbachia influenced CHIKV and YFV infection in Ae. aegypti. Following exposure to viremic blood meals, CHIKV infection and dissemination rates were significantly reduced in mosquitoes with the wMel strain of Wolbachia compared to Wolbachia-uninfected controls. However, similar rates of infection and dissemination were observed in wMel infected and non-infected Ae. aegypti when intrathoracic inoculation was used to deliver virus. YFV infection, dissemination and replication were similar in wMel-infected and control mosquitoes following intrathoracic inoculations. In contrast, mosquitoes with the wMelPop strain of Wolbachia showed at least a 104 times reduction in YFV RNA copies compared to controls. The extent of reduction in virus infection depended on Wolbachia strain, titer and strain of the virus, and mode of exposure. Although originally proposed for dengue biocontrol, our results indicate a Wolbachia-based strategy also holds considerable promise for YFV and CHIKV suppression. Mosquito-transmitted viruses such as dengue, yellow fever and chikungunya, are responsible for significant morbidity and mortality throughout tropical and sub-tropical regions of the world. These viruses are primarily transmitted by Aedes aegypti, a mosquito that due to its close association with humans has historically been difficult to control. An innovative control strategy involving the release of mosquitoes infected with the intracellular bacterium Wolbachia is currently being developed. This approach is based on the recent discovery that Wolbachia reduces infection of mosquitoes with dengue virus, malaria parasites and filarial nematodes. In the current study, we demonstrated that Wolbachia also blocks infection of chikungunya and yellow fever viruses in Ae. aegypti. The degree of virus inhibition depended on the strain of Wolbachia, the route of virus exposure, the virus strain and the titer of virus that the mosquitoes were exposed to. The implementation of Wolbachia-based control strategies has the capacity to transform the way that mosquitotransmitted diseases are controlled in the future.
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Affiliation(s)
- Andrew F van den Hurk
- Public Health Virology, Communicable Diseases Unit, Queensland Health Forensic and Scientific Services, Coopers Plains, Australia.
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Muller DA, Frentiu FD, Rojas A, Moreira LA, O’Neill SL, Young PR. A portable approach for the surveillance of dengue virus-infected mosquitoes. J Virol Methods 2012; 183:90-3. [DOI: 10.1016/j.jviromet.2012.03.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 03/15/2012] [Accepted: 03/26/2012] [Indexed: 10/28/2022]
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