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Purushothaman S, Azhahianambi P, Dharman M, Gokula Kannan R, Tirumurugaan KG, Soundararajan C, Aravindh Babu RP, Devaraju P, Prakash JAJ. A cross sectional study on molecular prevalence of Orientia tsutsugamushi in household rat population of South India. Comp Immunol Microbiol Infect Dis 2024; 111:102212. [PMID: 38880051 DOI: 10.1016/j.cimid.2024.102212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 06/08/2024] [Accepted: 06/13/2024] [Indexed: 06/18/2024]
Abstract
This study aimed to assess the molecular prevalence of mite-borne zoonotic pathogen O. tsutsugamushi in household rats of South India through nested polymerase chain reaction amplification of O. tsutsugamushi 47-kDa htrA gene and to determine the most suitable sample type for screening of O. tsutsugamushi in rats. Out of 85 rats trapped in Tamil Nadu, Karnataka, and Puducherry regions, 47 rats were found positive for the O. tsutsugamushi genome with prevalence of 55.29 %. Among different sample types screened, faecal samples exhibited the highest positivity rate, followed by liver, spleen, kidney, and blood samples. Agreement between faecal and spleen samples of rats for the presence of O. tsutsugamushi was the highest. Principal component analysis revealed a positive correlation between the spleen, liver, and faeces and a negative correlation between blood and faeces for the presence of O. tsutsugamushi genome. These findings underscore the varied distribution of O. tsutsugamushi among different samples and indicate that the faecal and liver samples of rats are an ideal choice of samples for epidemiological studies. This is the first study to report a high level of presence of O. tsutsugamushi in faecal samples of rats.
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Affiliation(s)
- S Purushothaman
- Translational Research Platform for Veterinary Biologicals, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600051, India
| | - P Azhahianambi
- Translational Research Platform for Veterinary Biologicals, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600051, India.
| | - M Dharman
- Translational Research Platform for Veterinary Biologicals, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600051, India
| | - R Gokula Kannan
- Translational Research Platform for Veterinary Biologicals, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600051, India
| | - K G Tirumurugaan
- Translational Research Platform for Veterinary Biologicals, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600051, India
| | - C Soundararajan
- Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600051, India
| | - R P Aravindh Babu
- Translational Research Platform for Veterinary Biologicals, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600051, India
| | | | - John A J Prakash
- Department of Clinical Microbiology, Christian Medical College, Vellore 632004, India
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Xu Y, Hu J, Shi Z, Chen W, Zhou J, Zhang B, Yong F, Khanal L, Jiang X, Chen Z. Integrative systematics and evolutionary history of Berylmys bowersi (Mammalia, Rodentia, Muridae). Ecol Evol 2023; 13:e10234. [PMID: 37408634 PMCID: PMC10318578 DOI: 10.1002/ece3.10234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 06/05/2023] [Accepted: 06/09/2023] [Indexed: 07/07/2023] Open
Abstract
The Bower's Berylmys (Berylmys bowersi) is one of the largest rodent species with a wide distribution range in southern China and the Indochinese Peninsula. The taxonomy and evolutionary history of the B. bowersi is still controversial and confusing. In this study, we used two mitochondrial (Cyt b and COI) and three nuclear (GHR, IRBP, and RAG1) genes to estimate the phylogeny, divergence times, and biogeographic history of B. bowersi. We also explored morphological variations among the specimens collected across China. Our phylogenetic analyses indicated that the traditional B. bowersi contains at least two species: B. bowersi and B. latouchei. Berylmys latouchei was considered a junior synonym of B. bowersi distributed in eastern China, which is confirmed to be distinguishable at specific level because of its larger size, relatively larger and whiter hind feet, and several cranial traits. The estimated split of B. bowersi and B. latouchei was at the early Pleistocene (ca. 2.00 Mya), which might be the outcome of the combined effects of climate change in the early Pleistocene and isolation by the Minjiang River. Our results highlight the Wuyi Mountains in northern Fujian, China, as a glacial refugia during the Pleistocene and call for more intensive surveys and systematic revisions of small mammals in eastern China.
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Affiliation(s)
- Yifan Xu
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of Education, School of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
- State Key Laboratory of Genetic Resources and Evolution & Yunnan Key Laboratory of Biodiversity and Ecological Security of Gaoligong Mountain, Kunming Institute of ZoologyChinese Academy of SciencesKunmingChina
| | - Jiangxiao Hu
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of Education, School of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
| | - Zifan Shi
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of Education, School of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
| | - Wenwen Chen
- School of Resources and Environmental EngineeringAnhui UniversityHefeiChina
| | - Jiajun Zhou
- Zhejiang Forest Resources Monitoring CenterHangzhouChina
| | - Baowei Zhang
- School of Life SciencesAnhui UniversityHefeiChina
| | - Fan Yong
- Nanjing Institute of Environmental SciencesMinistry of Ecology and EnvironmentNanjingChina
| | - Laxman Khanal
- Central Department of Zoology, Institute of Science and TechnologyTribhuvan UniversityKathmanduNepal
| | - Xuelong Jiang
- State Key Laboratory of Genetic Resources and Evolution & Yunnan Key Laboratory of Biodiversity and Ecological Security of Gaoligong Mountain, Kunming Institute of ZoologyChinese Academy of SciencesKunmingChina
| | - Zhongzheng Chen
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of Education, School of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
- State Key Laboratory of Genetic Resources and Evolution & Yunnan Key Laboratory of Biodiversity and Ecological Security of Gaoligong Mountain, Kunming Institute of ZoologyChinese Academy of SciencesKunmingChina
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Mohd-Azami SNI, Loong SK, Khoo JJ, Husin NA, Lim FS, Mahfodz NH, Ishak SN, Mohd-Taib FS, Makepeace BL, AbuBakar S. Molecular Surveillance for Vector-Borne Bacteria in Rodents and Tree Shrews of Peninsular Malaysia Oil Palm Plantations. Trop Med Infect Dis 2023; 8:tropicalmed8020074. [PMID: 36828490 PMCID: PMC9965954 DOI: 10.3390/tropicalmed8020074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 01/16/2023] [Accepted: 01/16/2023] [Indexed: 01/20/2023] Open
Abstract
Many human clinical cases attributed to vector-borne pathogens are underreported in Malaysia, especially in rural localities where healthcare infrastructures are lacking. Here, 217 small mammals, consisting of rodents and tree shrews, were trapped in oil palm plantations in the Peninsular Malaysia states of Johor and Perak. Species identification was performed using morphological and DNA barcoding analyses, and 203 small mammals were included in the detection of selected vector-borne bacteria. The DNA extracted from the spleens was examined for Orientia tsutsugamushi, Borrelia spp., Bartonella spp. and Rickettsia spp. using established PCR assays. The small mammals collected in this study included Rattus tanezumi R3 mitotype (n = 113), Rattus argentiventer (n = 24), Rattus tiomanicus (n = 22), Rattus exulans (n = 17), Rattus tanezumi sensu stricto (n = 1) and Tupaia glis (n = 40). Orientia tsutsugamushi, Borrelia spp. and Bartonella phoceensis were detected in the small mammals with the respective detection rates of 12.3%, 5.9% and 4.9%. Rickettsia spp., however, was not detected. This study encountered the presence of both Lyme disease and relapsing fever-related borreliae in small mammals collected from the oil palm plantation study sites. All three microorganisms (Orientia tsutsugamushi, Borrelia spp. and Bartonella phoceensis) were detected in the R. tanezumi R3 mitotype, suggesting that the species is a competent host for multiple microorganisms. Further investigations are warranted to elucidate the relationships between the ectoparasites, the small mammals and the respective pathogens.
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Affiliation(s)
- Siti Nurul Izzah Mohd-Azami
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Higher Institution Centre of Excellence, Universiti Malaya, Kuala Lumpur 50603, Malaysia
- Institute for Advanced Studies (IAS), Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Shih Keng Loong
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Higher Institution Centre of Excellence, Universiti Malaya, Kuala Lumpur 50603, Malaysia
- Correspondence:
| | - Jing Jing Khoo
- Institute of Infection, Veterinary & Ecological Sciences, University of Liverpool, Liverpool L3 5RF, UK
| | - Nurul Aini Husin
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Higher Institution Centre of Excellence, Universiti Malaya, Kuala Lumpur 50603, Malaysia
- Institute for Advanced Studies (IAS), Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Fang Shiang Lim
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Higher Institution Centre of Excellence, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Nur Hidayana Mahfodz
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Higher Institution Centre of Excellence, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Siti Nabilah Ishak
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
- Kuantan Fisheries Biosecurity Centre, Department of Fisheries Malaysia, Kuantan 25100, Malaysia
| | - Farah Shafawati Mohd-Taib
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
| | - Benjamin L. Makepeace
- Institute of Infection, Veterinary & Ecological Sciences, University of Liverpool, Liverpool L3 5RF, UK
| | - Sazaly AbuBakar
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Higher Institution Centre of Excellence, Universiti Malaya, Kuala Lumpur 50603, Malaysia
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Parai D, Pattnaik M, Kshatri JS, Rout UK, Peter A, Nanda RR, Sahoo SK, Mansingh A, Choudhary HR, Dash GC, Praharaj I, Bhattacharya D, Pati S. Scrub typhus seroprevalence from an eastern state of India: findings from the state-wide serosurvey. Trans R Soc Trop Med Hyg 2023; 117:22-27. [PMID: 35947959 DOI: 10.1093/trstmh/trac075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 05/30/2022] [Accepted: 07/29/2022] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Scrub typhus is a mite-borne infectious disease caused primarily by the obligate intracellular bacteria Orientia tsutsugamushi, which is transmitted by chigger mites. The objective of this study was to determine the prevalence of scrub typhus among adults in Odisha, an eastern state of India. METHODS A descriptive cross-sectional study was conducted to analyse 1840 serum samples from five districts (Khordha, Cuttack, Ganjam, Malkangiri and Sundargarh) of Odisha collected during 2020-2021. Both immunoglobulin G (IgG) and IgM antibodies against scrub typhus were tested using commercial enzyme-linked immunosorbent assay kits. Point estimates of the 95% confidence interval and adjusted odds ratio were calculated. RESULTS Of 1840 participants, the prevalence of IgG positivity was 1034 (56.19%) and that of IgM was 523 (28.42%). The majority of participants were in the 18-45 y age group (53.7%). Cuttack had the highest IgG positivity (64.54%) and Malkangiri had the lowest (29.32%). The highest and lowest positivity for IgM were found in Malkangiri (40.84%) and Cuttack (25.30%), respectively. CONCLUSIONS With an increasing number of infections detected in the state, scrub typhus is emerging as a public health threat. Increasing awareness among the general public and healthcare professionals through health education campaigns regarding scrub typhus is essential. Early detection of the disease through the establishment of a laboratory surveillance system is required to control the transmission of scrub typhus.
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Affiliation(s)
- Debaprasad Parai
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Matrujyoti Pattnaik
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Jaya Singh Kshatri
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Usha Kiran Rout
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Annalisha Peter
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Rashmi Ranjan Nanda
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Subrat Kumar Sahoo
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Asit Mansingh
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Hari Ram Choudhary
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Girish Chandra Dash
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Ira Praharaj
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Debdutta Bhattacharya
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
| | - Sanghamitra Pati
- Department of Microbiology, Indian Council of Medical Research-Regional Medical Research Centre, Chandrasekharpur, Bhubaneswar 751023, India
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Ehrlichia, Coxiella and Bartonella infections in rodents from Guizhou Province, Southwest China. Ticks Tick Borne Dis 2022; 13:101974. [DOI: 10.1016/j.ttbdis.2022.101974] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 05/20/2022] [Accepted: 05/23/2022] [Indexed: 11/20/2022]
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Wulandhari SA, Paladsing Y, Saesim W, Charoennitiwat V, Sonthayanon P, Kumlert R, Morand S, Sumruayphol S, Chaisiri K. High prevalence and low diversity of chigger infestation in small mammals found in Bangkok Metropolitan parks. MEDICAL AND VETERINARY ENTOMOLOGY 2021; 35:534-546. [PMID: 34021500 DOI: 10.1111/mve.12531] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 05/03/2021] [Accepted: 05/10/2021] [Indexed: 06/12/2023]
Abstract
Chiggers are recognized as vectors of scrub typhus disease caused by the bacteria, Orientia tsutsugamushi. The risk of disease exposure is mainly related to chigger bites when humans or animals roam into vector-infested habitats. In big cities, urban public parks could provide areas for the animal-human interface and zoonotic pathogen transmission. The ecology and epidemiology of urban scrub typhus are still poorly understood in Thailand. Small mammals were trapped and examined for chigger infestation in urban public parks across metropolitan Bangkok, Thailand. We found a high prevalence of infestation (76.8%) with surprisingly low diversity. Two chigger species, Leptotrombidium deliense and Ascoschoengastia indica, were identified using morphological characteristics and molecular confirmation. The generalized linear model identified host intrinsic variables (i.e. body mass index) with host density, habitat composition and open field as the extrinsic factors explaining the abundance of chigger infestation. The bacteria O. tsutsugamushi was not detected in chiggers (90 chigger-pooled samples) and animal host tissues (164 spleen samples). However, the existence of chigger vectors calls for the Bangkok Metropolitan Administration and public health authorities to develop a comprehensive scrub typhus monitoring and prevention strategy in the parks and nearby communities.
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Affiliation(s)
- S A Wulandhari
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Y Paladsing
- Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - W Saesim
- Environment Department, Bangkok Metropolitan Administration, Bangkok, Thailand
| | - V Charoennitiwat
- Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - P Sonthayanon
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - R Kumlert
- Division of Vector-Borne Diseases, Department of Disease Control, Ministry of Public Health, Nonthaburi, Thailand
| | - S Morand
- Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- CNRS-CIRAD, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand
| | - S Sumruayphol
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - K Chaisiri
- Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
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Elliott I, Thangnimitchok N, Chaisiri K, Wangrangsimakul T, Jaiboon P, Day NPJ, Paris DH, Newton PN, Morand S. Orientia tsutsugamushi dynamics in vectors and hosts: ecology and risk factors for foci of scrub typhus transmission in northern Thailand. Parasit Vectors 2021; 14:540. [PMID: 34663445 PMCID: PMC8524837 DOI: 10.1186/s13071-021-05042-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 09/27/2021] [Indexed: 11/10/2022] Open
Abstract
Background Scrub typhus is an important neglected vector-borne zoonotic disease across the Asia–Pacific region, with an expanding known distribution. The disease ecology is poorly understood, despite the large global burden of disease. The key determinants of high-risk areas of transmission to humans are unknown. Methods Small mammals and chiggers were collected over an 18-month period at three sites of differing ecological profiles with high scrub typhus transmission in Chiang Rai Province, northern Thailand. Field samples were identified and tested for Orientia tsutsugamushi by real-time PCR. The rates and dynamics of infection were recorded, and positive and negative individuals were mapped over time at the scale of single villages. Ecological analyses were performed to describe the species richness, community structure and interactions between infected and uninfected species and habitats. Generalised linear modelling (GLM) was applied to examine these interactions. Results The site with the highest rates of human infection was associated with the highest number of infected chigger pools (41%), individual chiggers (16%), proportion of the known vector species Leptotrombidium deliense (71%) and chigger index (151). Chigger species diversity was lowest (Shannon diversity index H′: 1.77) and rodent density appeared to be high. There were no consistent discrete foci of infection identified at any of the study sites. The small mammals Rattus tanezumi and Bandicota indica and the chiggers L. deliense and Walchia kritochaeta emerged as central nodes in the network analysis. In the GLM, the end of the dry season, and to a lesser extent the end of the wet season, was associated with O. tsutsugamushi-infected small mammals and chiggers. A clear positive association was seen between O. tsutsugamushi-positive chigger pools and the combination of O. tsutsugamushi-positive chigger pools and O. tsutsugamushi-positive small mammals with lowland habitats. Conclusions These findings begin to reveal some of the factors that may determine high-risk foci of scrub typhus at a fine local scale. Understanding these factors may allow practical public health interventions to reduce disease risk. Further studies are needed in areas with diverse ecology. Graphical abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-05042-4.
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Affiliation(s)
- Ivo Elliott
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR. .,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.
| | - Neeranuch Thangnimitchok
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR
| | | | - Tri Wangrangsimakul
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.,Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Piangnet Jaiboon
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Nicholas P J Day
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.,Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Daniel H Paris
- Department of Medicine, Swiss Tropical and Public Health Institute, Basel, Switzerland.,Department of Clinical Research, University of Basel, Basel, Switzerland
| | - Paul N Newton
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.,Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Serge Morand
- CNRS ISEM-CIRAD ASTRE, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand
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Ernieenor FCL, NorJaiza MJ, Fadillah A, Canedy J, Mariana A. Screening and genotyping of Orientia tsutsugamushi from field-collected on-host chiggers (Acari: Prostigmata) recovered from a positive scrub typhus locality in Kelantan, Malaysia. EXPERIMENTAL & APPLIED ACAROLOGY 2021; 84:171-182. [PMID: 33826009 DOI: 10.1007/s10493-021-00609-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Orientia tsutsugamushi is the causative agent of scrub typhus vectored by larval stages of trombiculid mites (chiggers) that occur in most tropical regions of Southeast Asia. A total of 242 chiggers extracted from eight small mammals captured from a positive scrub typhus locality in Kelantan, Malaysia, were screened for the presence of O. tsutsugamushi. The chiggers were grouped in 16 pools for extraction of DNA prior to screening of O. tsutsugamushi based on the nucleotide sequence of 56-kDa type specific antigen (TSA) gene using nested polymerase chain reaction. Two species of on-host chiggers were identified, the one, Leptotrombidium deliense, much more dominant (94.8%) than the other, Ascoshoengastia sp. (5.2%). The pathogen was detected in two pools (12.5%) of L. deliense recovered from Rattus rattus and Tupaia sp. The 56-kDa TSA gene sequence analysis revealed the O. tsutsugamushi harboured in those chiggers were Karp prototype strain with high similarity (99.3%). Findings of this study strongly supported the existence of scrub typhus infections in certain parts of Malaysia which agrees with previous local reports. Moreover, this study highlighted the pressing need of a large-scale close observation of O. tsutsugamushi DNA sequences from chiggers that can probably be collected from other positive scrub typhus localities to precisely provide the distribution and prevalence of this zoonotic pathogen.
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Affiliation(s)
- F C L Ernieenor
- Infectious Diseases Research Centre, Institute for Medical Research (IMR), National Institutes of Health, Ministry of Health Malaysia, Acarology Unit, Jalan Setia Murni U13/52, Seksyen U13, Setia Alam, 40170, Shah Alam, Selangor, Malaysia.
| | - M J NorJaiza
- Disease Control Division, Entomology and Pest Unit, Kelantan State Health Department, Ministry of Health Malaysia, Jalan Mahmood, 15200, Kota Bharu, Kelantan, Malaysia
| | - A Fadillah
- Infectious Diseases Research Centre, Institute for Medical Research (IMR), National Institutes of Health, Ministry of Health Malaysia, Acarology Unit, Jalan Setia Murni U13/52, Seksyen U13, Setia Alam, 40170, Shah Alam, Selangor, Malaysia
| | - J Canedy
- Infectious Diseases Research Centre, Institute for Medical Research (IMR), National Institutes of Health, Ministry of Health Malaysia, Acarology Unit, Jalan Setia Murni U13/52, Seksyen U13, Setia Alam, 40170, Shah Alam, Selangor, Malaysia
| | - A Mariana
- Infectious Diseases Research Centre, Institute for Medical Research (IMR), National Institutes of Health, Ministry of Health Malaysia, Acarology Unit, Jalan Setia Murni U13/52, Seksyen U13, Setia Alam, 40170, Shah Alam, Selangor, Malaysia
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Paulraj P, Renu G, Ranganathan K, Veeramanoharan R. A comparative study to evaluate wonder and Sherman traps for the surveillance of ectoparasitic chigger vector mites of the scrub typhus. J Vector Borne Dis 2021; 58:141-147. [DOI: 10.4103/0972-9062.321752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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10
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Elders PND, Swe MMM, Phyo AP, McLean ARD, Lin HN, Soe K, Htay WYA, Tanganuchitcharnchai A, Hla TK, Tun NN, Nwe TT, Moe MM, Thein WM, Zaw NN, Kyaw WM, Linn H, Htwe YY, Smithuis FM, Blacksell SD, Ashley EA. Serological evidence indicates widespread distribution of rickettsioses in Myanmar. Int J Infect Dis 2020; 103:494-501. [PMID: 33310022 PMCID: PMC7862081 DOI: 10.1016/j.ijid.2020.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/04/2020] [Accepted: 12/07/2020] [Indexed: 11/26/2022] Open
Abstract
Diagnosis of rickettsial infections is difficult in low-resource settings; this leads to delays in receiving appropriate treatment. Before this study, the distribution of rickettsioses in Myanmar was not known. This serosurvey shows that rickettsioses are widespread in Myanmar. Particularly high prevalence of scrub typhus was found in central and northern regions.
Background Little research has been published on the prevalence of rickettsial infections in Myanmar. This study determined the seroprevalence of immunoglobulin G (IgG) antibodies to rickettsial species in different regions of Myanmar. Methods Seven hundred leftover blood samples from patients of all ages in primary care clinics and hospitals in seven regions of Myanmar were collected. Samples were screened for scrub typhus group (STG), typhus group (TG) and spotted fever group (SFG) IgG antibodies using enzyme-linked immunosorbent assays (ELISA). Immunofluorescence assays were performed for the same rickettsial groups to confirm seropositivity if ELISA optical density ≥0.5. Results Overall IgG seroprevalence was 19% [95% confidence interval (CI) 16–22%] for STG, 5% (95% CI 3–7%) for TG and 3% (95% CI: 2–5%) for SFG. The seroprevalence of STG was particularly high in northern and central Myanmar (59% and 19–33%, respectively). Increasing age was associated with higher odds of STG and TG seropositivity [per 10-year increase, adjusted odds ratio estimate 1.68 (p < 0.01) and 1.24 (p = 0.03), respectively]. Conclusion Rickettsial infections are widespread in Myanmar, with particularly high seroprevalence of STG IgG antibodies in central and northern regions. Healthcare workers should consider rickettsial infections as common causes of fever in Myanmar.
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Affiliation(s)
| | | | | | - Alistair R D McLean
- Myanmar Oxford Clinical Research Unit, Yangon, Myanmar; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | | | - Kyaw Soe
- Myanmar Oxford Clinical Research Unit, Yangon, Myanmar
| | | | - Ampai Tanganuchitcharnchai
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Thel K Hla
- Myanmar Oxford Clinical Research Unit, Yangon, Myanmar; Medical Action Myanmar, Yangon, Myanmar
| | - Ni Ni Tun
- Medical Action Myanmar, Yangon, Myanmar
| | - Thin Thin Nwe
- Magway General Hospital and University of Medicine, Magway, Myanmar; University of Medicine 2, Yangon, Myanmar
| | - Myat Myat Moe
- Magway General Hospital and University of Medicine, Magway, Myanmar
| | - Win May Thein
- Mandalay General Hospital and University of Medicine, Mandalay, Myanmar
| | - Ni Ni Zaw
- Mandalay General Hospital and University of Medicine, Mandalay, Myanmar
| | | | - Htun Linn
- Monywa General Hospital, Monywa, Myanmar
| | | | - Frank M Smithuis
- Myanmar Oxford Clinical Research Unit, Yangon, Myanmar; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom; Medical Action Myanmar, Yangon, Myanmar
| | - Stuart D Blacksell
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom; Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Elizabeth A Ashley
- Myanmar Oxford Clinical Research Unit, Yangon, Myanmar; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom; Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao Democratic People's Republic.
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11
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Park JW, Yu DS, Lee GS, Seo JJ, Chung JK, Lee JI. Epidemiological Characteristics of Rodents and Chiggers with Orientia Tsutsugamushi in the Republic of Korea. THE KOREAN JOURNAL OF PARASITOLOGY 2020; 58:559-564. [PMID: 33202508 PMCID: PMC7672239 DOI: 10.3347/kjp.2020.58.5.559] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 09/26/2020] [Indexed: 01/31/2023]
Abstract
A survey of rodents and chiggers associated with Orientia tsutsugamushi was conducted in a rural region of the Republic of Korea (Korea) between 2014 and 2018. Overall Apodemus agrarius 15.2% had the highest seropisitive for O. tsutsugamushi, followed by Myodes regulus 11.4%. Monthly risk factors using logistic regression analysis were not associated with O. tsutsugamushi infections in rodents. The overall prevalence rate of O. tsutsugamushi among chiggers was 0.3%. The chigger (Leptotrombidium scutellare) and monthly (October) risk factors were associated with O. tsutsugamushi human infections (P<0.05). Orientia tsutsugamushi infections are endemic in rodents in Korea and people, for example, soldiers who are active outdoors, must employ preventive measures, especially during October (P<0.05). When there are many reports of O. tsutsugamushi infections in Korea. The Boryong strain 85.7% (2/14) was the most common strain detected in chiggers, followed by the Shimokoshi 7.1% (1/14) and Karp 7.1% strains.
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Affiliation(s)
- Jung Wook Park
- Division of Infectious Disease Investigation, Health and Environment Research Institute of Gwangju, Gwangju 61986, Korea
| | - Dae Sung Yu
- Division of Animal Disease Control, Animal and Plant Quarantine Agency, Gyeongsangbuk-do 39660, Korea
| | - Gi Seong Lee
- Division of Infectious Disease Investigation, Health and Environment Research Institute of Gwangju, Gwangju 61986, Korea
| | - Jin Jong Seo
- Division of Infectious Disease Investigation, Health and Environment Research Institute of Gwangju, Gwangju 61986, Korea
| | - Jae Keun Chung
- Division of Infectious Disease Investigation, Health and Environment Research Institute of Gwangju, Gwangju 61986, Korea
| | - Jae Il Lee
- Department of Veterinary Public Health, College of Veterinary Medicine, Chonnam National University, Gwangju 62287, Korea
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Kumlert R, Pawestri AR, Linsuwanon P, Morand S. Innovative Distance Learning Tool for Morphological Identification of Chigger Mites (Actinotrichida) as Vectors of Scrub Typhus: A Pilot Study. Trop Med Infect Dis 2020; 5:tropicalmed5020055. [PMID: 32260591 PMCID: PMC7345848 DOI: 10.3390/tropicalmed5020055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/29/2020] [Accepted: 04/02/2020] [Indexed: 11/30/2022] Open
Abstract
Scrub typhus, a disease caused by Orientia tsutsugamushi, affects more than one billion people globally with an average fatality rate of 6%. Humans are accidentally infected through the bite of trombiculid mite larvae (chiggers). Chiggers feed on hosts’ extracellular fluid for survival and development. O. tsutsugamushi is maintained throughout the chigger’s lifespan and over several generations. Although disease-related knowledge is essential in designing effective control strategies, many personnel in related sectors are unfamiliar with this disease and its vector. To tackle this issue, we developed a distance learning tool using educational videos on scrub typhus- and vector-related topics. The learning method is facilitated online, and students and tutors are not required to be physically present at the same place and time, thus allowing flexibility and accessibility. Knowledge improvement of 34 participants from related sectors was evaluated by pre- and post-test questionnaires. Although 54% of participants had prior knowledge of scrub typhus, 76.5% still lack basic knowledge of vector identification. After the distance learning, the average score increased significantly from the baseline (p < 0.05). Most participants showed interest in the topic and learning method. These results suggest that the distance learning method was promising in distributing health-related information and might be applied to other diseases and communities.
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Affiliation(s)
- Rawadee Kumlert
- The Office of Disease Prevention and Control 12, Songkhla Province (ODPC12), Department of Disease Control, Ministry of Public Health, Songkhla 90000, Thailand;
| | - Aulia Rahmi Pawestri
- Faculty of Tropical Medicine, Mahidol University (FTM, MU), Bangkok 10400, Thailand;
- Faculty of Medicine, Universitas Brawijaya, Malang 65145, Indonesia
| | - Piyada Linsuwanon
- United States Medical Directorate-Armed Forces Research Institute of Medical Sciences (US-AFRIMS), Bangkok 10400, Thailand;
| | - Serge Morand
- Faculty of Tropical Medicine, Mahidol University (FTM, MU), Bangkok 10400, Thailand;
- Institut des Sciences de l’Evolution—Montpellier University—National Centre for Scientific Research (CNRS)—French Agricultural Research Centre for International Development (CIRAD), 34090 Montpellier, France
- Faculty of Veterinary Technology, Kasetsart Univesity, Bangkok 10900, Thailand
- Correspondence: ; Tel.: +66-8-7040-5616
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13
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Chaisiri K, Gill AC, Stekolnikov AA, Hinjoy S, McGarry JW, Darby AC, Morand S, Makepeace BL. Ecological and microbiological diversity of chigger mites, including vectors of scrub typhus, on small mammals across stratified habitats in Thailand. Anim Microbiome 2019; 1:18. [PMID: 33499969 PMCID: PMC7807494 DOI: 10.1186/s42523-019-0019-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 11/20/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Scrub typhus, caused by a bacterial pathogen (Orientia spp.), is a potentially life-threatening febrile illness widely distributed in the Asia-Pacific region and is emerging elsewhere. The infection is transmitted by the larval stage of trombiculid mites ("chiggers") that often exhibit low host specificity. Here, we present an analysis of chigger ecology for 38 species sampled from 11 provinces of Thailand and microbiomes for eight widespread species. RESULTS In total, > 16,000 individual chiggers were collected from 1574 small mammal specimens belonging to 18 species across four horizontally-stratified habitat types. Chigger species richness was positively associated with higher latitudes, dry seasonal conditions, and host maturity; but negatively associated with increased human land use. Human scrub typhus incidence was found to be positively correlated with chigger species richness. The bacterial microbiome of chiggers was highly diverse, with Sphingobium, Mycobacterium, Neisseriaceae and various Bacillales representing the most abundant taxa. Only Leptotrombidium deliense was found to be infected with Orientia and another potential pathogen, Borrelia spp., was frequently detected in pools of this species. β-diversity, but not α-diversity, was significantly different between chigger species and geographic regions, although not between habitat types. CONCLUSION Our study identified several key environmental and host-derived correlates of chigger species richness across Thailand, which in turn impacted on human scrub typhus incidence. Moreover, this first extensive field survey of the chigger microbiome revealed species- and province-level variation in microbial β-diversity across the country, providing a framework for future studies on interactions between pathogens and other symbionts in these understudied vectors.
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Affiliation(s)
- Kittipong Chaisiri
- Institute of Infection & Global Health, University of Liverpool, Liverpool, UK
- Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - A. Christina Gill
- Institute of Infection & Global Health, University of Liverpool, Liverpool, UK
- Biomedical Services, University of Oxford, Oxford, UK
| | | | - Soawapak Hinjoy
- Department of Disease Control, Ministry of Public Health, Nonthaburi, Thailand
| | - John W. McGarry
- Institute of Veterinary Science, University of Liverpool, Liverpool, UK
| | - Alistair C. Darby
- Institute of Integrative Biology, University of Liverpool, Liverpool, UK
| | - Serge Morand
- Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand
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14
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Jäkel T, Promkerd P, Sitthirath R, Guedant P, Khoprasert Y. Biocontrol of rats in an urban environment in Southeast Asia using Sarcocystis singaporensis. PEST MANAGEMENT SCIENCE 2019; 75:2148-2157. [PMID: 30637908 DOI: 10.1002/ps.5335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 01/07/2019] [Accepted: 01/09/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Upon request of the local administration a control campaign targeting commensal rats (Rattus rattus, R. exulans) was conducted in 30 sub-districts (villages) of the World Heritage town Luang Prabang, Northern Laos, using rat bait containing lethal quantities of the parasitic protist Sarcocystis singaporensis. The associated investigations assessed the short-term control efficacy, willingness of residents to co-operate (community approach), and temporal and spatial changes of the urban rat population in response to treatment. RESULTS Biological rodent control significantly reduced rodent activity (percentage of positive tracking patches) in the town, from a mean of 25.3% (±12.8% SD) before (January-February) down to 8.0% (±4.4%) after (June) treatment. Reduction of rodent activity relative to three untreated villages was 83%. Similarly, residents observed significantly fewer rats on their properties after the campaign (mean percentage of households (HHs) per village with sightings), whereby reduction of sightings amounted to 57%. There was significant correlation between residents' observation rates and rodent activity. Among 94 rats trapped before and after treatment each, proportions of adult R. exulans and juvenile R. rattus were higher after rodent control, suggesting that a considerable part of the adult house rat population had been removed. Furthermore, a 5% post-campaign incidence of infection suggested that few rats had survived bait uptake. CONCLUSION S. singaporensis may be used successfully as tactical biocontrol agent for culling of rats in urban environments. We propose additional components of a long-term rodent management strategy for the town, without which the impact of culling campaigns would be limited. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Thomas Jäkel
- German International Cooperation (GIZ), Bangkok, Thailand
| | - Prasartthong Promkerd
- Department of Agriculture, Plant Protection Research and Development Office, Bangkok, Thailand
| | - Rasmy Sitthirath
- Department of World Heritage Conservation, La Maison du Patrimone, Luang Prabang, Laos
| | - Pierre Guedant
- Department of World Heritage Conservation, La Maison du Patrimone, Luang Prabang, Laos
| | - Yuvaluk Khoprasert
- Department of Agriculture, Plant Protection Research and Development Office, Bangkok, Thailand
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15
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Phuentshok Y, Dorji K, Zangpo T, Davidson SA, Takhampunya R, Tenzinla T, Dorjee C, Morris RS, Jolly PD, Dorjee S, McKenzie JS. Survey and Phylogenetic Analysis of Rodents and Important Rodent-Borne Zoonotic Pathogens in Gedu, Bhutan. THE KOREAN JOURNAL OF PARASITOLOGY 2018; 56:521-525. [PMID: 30419740 PMCID: PMC6243181 DOI: 10.3347/kjp.2018.56.5.521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 09/24/2018] [Indexed: 11/23/2022]
Abstract
Rodents are well-known reservoirs and vectors of many emerging and re-emerging infectious diseases, but little is known about their role in zoonotic disease transmission in Bhutan. In this study, a cross-sectional investigation of zoonotic disease pathogens in rodents was performed in Chukha district, Bhutan, where a high incidence of scrub typhus and cases of acute undifferentiated febrile illness had been reported in people during the preceding 4–6 months. Twelve rodents were trapped alive using wire-mesh traps. Following euthanasia, liver and kidney tissues were removed and tested using PCR for Orientia tsutsugamushi and other bacterial and rickettsial pathogens causing bartonellosis, borreliosis, human monocytic ehrlichiosis, human granulocytic anaplasmosis, leptospirosis, and rickettsiosis. A phylogenetic analysis was performed on all rodent species captured and pathogens detected. Four out of the 12 rodents (33.3%) tested positive by PCR for zoonotic pathogens. Anaplasma phagocytophilum, Bartonella grahamii, and B. queenslandensis were identified for the first time in Bhutan. Leptospira interrogans was also detected for the first time from rodents in Bhutan. The findings demonstrate the presence of these zoonotic pathogens in rodents in Bhutan, which may pose a risk of disease transmission to humans.
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Affiliation(s)
- Yoenten Phuentshok
- One Health Epidemiology Fellowship Program, Massey University, Palmerston North, New Zealand.,National Centre for Animal Health, Department of Livestock, Ministry of Agriculture and Forests, Serbithang, Bhutan
| | - Kezang Dorji
- One Health Epidemiology Fellowship Program, Massey University, Palmerston North, New Zealand
| | - Tandin Zangpo
- One Health Epidemiology Fellowship Program, Massey University, Palmerston North, New Zealand
| | - Silas A Davidson
- Entomology Department, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Ratree Takhampunya
- Entomology Department, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Tenzinla Tenzinla
- National Centre for Animal Health, Department of Livestock, Ministry of Agriculture and Forests, Serbithang, Bhutan
| | - Chencho Dorjee
- Khesar Gyalpo University of Medical Sciences of Bhutan, Thimphu, Bhutan
| | - Roger S Morris
- MorVet Ltd, Consultancy Services in Health Risk Management and Food Safety Policy, Masterton, New Zealand
| | - Peter D Jolly
- International Development Group, School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - Sithar Dorjee
- Khesar Gyalpo University of Medical Sciences of Bhutan, Thimphu, Bhutan
| | - Joanna S McKenzie
- International Development Group, School of Veterinary Science, Massey University, Palmerston North, New Zealand
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16
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McMahon BJ, Morand S, Gray JS. Ecosystem change and zoonoses in the Anthropocene. Zoonoses Public Health 2018; 65:755-765. [PMID: 30105852 DOI: 10.1111/zph.12489] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 05/08/2018] [Accepted: 05/27/2018] [Indexed: 12/21/2022]
Abstract
Changes in land use, animal populations and climate, primarily due to increasing human populations, drive the emergence of zoonoses. Force of infection (FOI), which for these diseases is a measure of the ease with which a pathogen reaches the human population, can change with specific zoonoses and context. Here, we outline three ecosystem categories-domestic, peridomestic and sylvatic, where disease ecology alters the FOI of specific zoonoses. Human intervention is an overriding effect in the emergence of zoonoses; therefore, we need to understand the disease ecology and other influencing factors of pathogens and parasites that are likely to interact differently within ecological and cultural contexts. Planning for One Health and community ecology, such as an ecological impact assessment, is required to prepare and manage the emergence and impact of zoonoses in the Anthropocene.
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Affiliation(s)
- Barry J McMahon
- UCD School of Agriculture & Food Science, University College Dublin, Dublin 4, Ireland
| | - Serge Morand
- CNRS - CIRAD ASTRE, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand
| | - Jeremy S Gray
- UCD School of Biology & Environmental Science, University College Dublin, Dublin 4, Ireland
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Leggat PA, Graves P, Laha T, Aye KS. Neglected and Emerging Tropical Diseases in South and Southeast Asia and Northern Australia. Trop Med Infect Dis 2018; 3:E70. [PMID: 30274466 PMCID: PMC6160933 DOI: 10.3390/tropicalmed3030070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 06/20/2018] [Indexed: 11/17/2022] Open
Affiliation(s)
- Peter A Leggat
- World Health Organization Collaborating Centre for Vectorborne and Neglected Tropical Diseases, College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia.
- Faculty of Science, University of Nottingham Malaysia Campus, Jalan Broga, Semenyih 43500, Selangor Darul Ehsan, Malaysia.
| | - Patricia Graves
- World Health Organization Collaborating Centre for Vectorborne and Neglected Tropical Diseases, College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia.
| | - Thewarach Laha
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand.
| | - Khin Saw Aye
- Department of Medical Research, Ministry of Health and Sports, Yangon 11191, Myanmar.
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