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Beranek M, Torres C, Laurito M, Farías A, Contigiani M, Almirón W, Diaz A. Emergence of genotype III St. Louis encephalitis virus in the western United States potentially linked to a wetland in Argentina. Acta Trop 2024; 250:107088. [PMID: 38043673 DOI: 10.1016/j.actatropica.2023.107088] [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: 09/22/2023] [Revised: 11/28/2023] [Accepted: 11/28/2023] [Indexed: 12/05/2023]
Abstract
St. Louis encephalitis virus (SLEV) is endemic in the Americas and its transmission networks involve Culex mosquitoes and avian species. In 2015, a human encephalitis outbreak took place in Arizona and California, indicating the re-emergence of this pathogen in the US. Viral strains isolated in that outbreak belong to genotype III SLEV previously detected only in South America. In this study, genotype III SLEV was detected in mosquitoes collected in Mar Chiquita Lagoon (Córdoba, Argentina), an overwintering site for numerous migratory bird species. The genotype III SLEV sequence detected in this site shares the closest known ancestor with those introduced in Arizona in 2015. Our results highlight the potential significance of wetlands as key sites for arbovirus maintenance and emergence.
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Affiliation(s)
- Mauricio Beranek
- Instituto de Virología "Dr. J.M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
| | - Carolina Torres
- Cátedra de Virología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Buenos Aires C1113AAD, Argentina; Consejo Nacional de Investigación Científica y Técnica (CONICET), Argentina
| | - Magdalena Laurito
- Departamento de Ciencias Básicas y Tecnológicas, Universidad Nacional de Chilecito, Chilecito, La Rioja 5360, Argentina; Consejo Nacional de Investigación Científica y Técnica (CONICET), Argentina
| | - Adrián Farías
- Instituto de Virología "Dr. J.M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
| | - Marta Contigiani
- Instituto de Virología "Dr. J.M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
| | - Walter Almirón
- Instituto de Investigaciones Biológicas y Tecnológicas, Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Córdoba 5000, Argentina; Consejo Nacional de Investigación Científica y Técnica (CONICET), Argentina
| | - Adrián Diaz
- Instituto de Virología "Dr. J.M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina; Consejo Nacional de Investigación Científica y Técnica (CONICET), Argentina.
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Raban R, Gendron WAC, Akbari OS. A perspective on the expansion of the genetic technologies to support the control of neglected vector-borne diseases and conservation. FRONTIERS IN TROPICAL DISEASES 2022. [DOI: 10.3389/fitd.2022.999273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
Genetic-based technologies are emerging as promising tools to support vector population control. Vectors of human malaria and dengue have been the main focus of these development efforts, but in recent years these technologies have become more flexible and adaptable and may therefore have more wide-ranging applications. Culex quinquefasciatus, for example, is the primary vector of avian malaria in Hawaii and other tropical islands. Avian malaria has led to the extinction of numerous native bird species and many native bird species continue to be threatened as climate change is expanding the range of this mosquito. Genetic-based technologies would be ideal to support avian malaria control as they would offer alternatives to interventions that are difficult to implement in natural areas, such as larval source reduction, and limit the need for chemical insecticides, which can harm beneficial species in these natural areas. This mosquito is also an important vector of human diseases, such as West Nile and Saint Louis encephalitis viruses, so genetic-based control efforts for this species could also have a direct impact on human health. This commentary will discuss the current state of development and future needs for genetic-based technologies in lesser studied, but important disease vectors, such as C. quinquefasciatus, and make comparisons to technologies available in more studied vectors. While most current genetic control focuses on human disease, we will address the impact that these technologies could have on both disease and conservation focused vector control efforts and what is needed to prepare these technologies for evaluation in the field. The versatility of genetic-based technologies may result in the development of many important tools to control a variety of vectors that impact human, animal, and ecosystem health.
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Danforth ME, Snyder RE, Feiszli T, Bullick T, Messenger S, Hanson C, Padgett K, Coffey LL, Barker CM, Reisen WK, Kramer VL. Epidemiologic and environmental characterization of the Re-emergence of St. Louis Encephalitis Virus in California, 2015-2020. PLoS Negl Trop Dis 2022; 16:e0010664. [PMID: 35939506 PMCID: PMC9387929 DOI: 10.1371/journal.pntd.0010664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 08/18/2022] [Accepted: 07/15/2022] [Indexed: 11/18/2022] Open
Abstract
St. Louis encephalitis virus (SLEV) is an endemic flavivirus in the western and southeastern United States, including California. From 1938 to 2003, the virus was detected annually in California, but after West Nile virus (WNV) arrived in 2003, SLEV was not detected again until it re-emerged in Riverside County in 2015. The re-emerging virus in California and other areas of the western US is SLEV genotype III, which previously had been detected only in Argentina, suggesting a South American origin. This study describes SLEV activity in California since its re-emergence in 2015 and compares it to WNV activity during the same period. From 2015 to 2020, SLEV was detected in 1,650 mosquito pools and 26 sentinel chickens, whereas WNV was detected concurrently in 18,108 mosquito pools and 1,542 sentinel chickens from the same samples. There were 24 reported human infections of SLEV in 10 California counties, including two fatalities (case fatality rate: 8%), compared to 2,469 reported human infections of WNV from 43 California counties, with 143 fatalities (case fatality rate: 6%). From 2015 through 2020, SLEV was detected in 17 (29%) of California's 58 counties, while WNV was detected in 54 (93%). Although mosquitoes and sentinel chickens have been tested routinely for arboviruses in California for over fifty years, surveillance has not been uniform throughout the state. Of note, since 2005 there has been a steady decline in the use of sentinel chickens among vector control agencies, potentially contributing to gaps in SLEV surveillance. The incidence of SLEV disease in California may have been underestimated because human surveillance for SLEV relied on an environmental detection to trigger SLEV patient screening and mosquito surveillance effort is spatially variable. In addition, human diagnostic testing usually relies on changes in host antibodies and SLEV infection can be indistinguishable from infection with other flaviviruses such as WNV, which is more prevalent.
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Affiliation(s)
- Mary E. Danforth
- California Department of Public Health, Vector-Borne Disease Section, Richmond and Sacramento, California
| | - Robert E. Snyder
- California Department of Public Health, Vector-Borne Disease Section, Richmond and Sacramento, California
| | - Tina Feiszli
- California Department of Public Health, Vector-Borne Disease Section, Richmond and Sacramento, California
| | - Teal Bullick
- California Department of Public Health, Viral and Rickettsial Disease Laboratory, Richmond, California
| | - Sharon Messenger
- California Department of Public Health, Viral and Rickettsial Disease Laboratory, Richmond, California
| | - Carl Hanson
- California Department of Public Health, Viral and Rickettsial Disease Laboratory, Richmond, California
| | - Kerry Padgett
- California Department of Public Health, Vector-Borne Disease Section, Richmond and Sacramento, California
| | - Lark L. Coffey
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - Christopher M. Barker
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - William K. Reisen
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - Vicki L. Kramer
- California Department of Public Health, Vector-Borne Disease Section, Richmond and Sacramento, California
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Mansilla AP, Grande JM, Diaz A. Effect of Agroecosystems on Seroprevalence of St. Louis Encephalitis and West Nile Viruses in Birds, La Pampa, Argentina, 2017-2019. Emerg Infect Dis 2022; 28:1393-1402. [PMID: 35731160 PMCID: PMC9239869 DOI: 10.3201/eid2807.211485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
In Argentina, the Pampa ecoregion has been almost completely transformed into agroecosystems. To evaluate the environmental (agricultural area, tree coverage, distance to the nearest water body and urban site) and biological (dove, cowbird, and sparrow abundance) effects on free-ranging bird exposure to St. Louis encephalitis virus (SLEV) and West Nile virus (WNV), we used generalized linear mixed models. For 1,019 birds sampled during 2017–2019, neutralizing antibodies were found against SLEV in samples from 60 (5.8%) birds and against WNV for 21 (2.1%). The best variable for explaining SLEV seroprevalence was agricultural area, which had a positive effect; however, for WNV, no model was conclusive. Our results suggest that agroecosystems in the La Pampa ecoregion increase the exposure of avian hosts to SLEV, thus potentially increasing virus activity.
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Ridenour CL, Cocking J, Poidmore S, Erickson D, Brock B, Valentine M, Roe CC, Young SJ, Henke JA, Hung KY, Wittie J, Stefanakos E, Sumner C, Ruedas M, Raman V, Seaton N, Bendik W, Hornstra O’Neill HM, Sheridan K, Centner H, Lemmer D, Fofanov V, Smith K, Will J, Townsend J, Foster JT, Keim PS, Engelthaler DM, Hepp CM. St. Louis Encephalitis Virus in the Southwestern United States: A Phylogeographic Case for a Multi-Variant Introduction Event. Front Genet 2021; 12:667895. [PMID: 34168675 PMCID: PMC8217752 DOI: 10.3389/fgene.2021.667895] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 04/28/2021] [Indexed: 11/14/2022] Open
Abstract
Since the reemergence of St. Louis Encephalitis (SLE) Virus (SLEV) in the Southwest United States, identified during the 2015 outbreak in Arizona, SLEV has been seasonally detected within Culex spp. populations throughout the Southwest United States. Previous work revealed the 2015 outbreak was caused by an importation of SLEV genotype III, which had only been detected previously in Argentina. However, little is known about when the importation occurred or the transmission and genetic dynamics since its arrival into the Southwest. In this study, we sought to determine whether the annual detection of SLEV in the Southwest is due to enzootic cycling or new importations. To address this question, we analyzed 174 SLEV genomes (142 sequenced as part of this study) using Bayesian phylogenetic analyses to estimate the date of arrival into the American Southwest and characterize the underlying population structure of SLEV. Phylogenetic clustering showed that SLEV variants circulating in Maricopa and Riverside counties form two distinct populations with little evidence of inter-county transmission since the onset of the outbreak. Alternatively, it appears that in 2019, Yuma and Clark counties experienced annual importations of SLEV that originated in Riverside and Maricopa counties. Finally, the earliest representatives of SLEV genotype III in the Southwest form a polytomy that includes both California and Arizona samples. We propose that the initial outbreak most likely resulted from the importation of a population of SLEV genotype III variants, perhaps in multiple birds, possibly multiple species, migrating north in 2013, rather than a single variant introduced by one bird.
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Affiliation(s)
- Chase L. Ridenour
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Jill Cocking
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Samuel Poidmore
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Daryn Erickson
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Breezy Brock
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Michael Valentine
- Translational Genomics Research Institute, Flagstaff, AZ, United States
| | - Chandler C. Roe
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Steven J. Young
- Vector Control Division, Maricopa County Environmental Services Department, Phoenix, AZ, United States
| | - Jennifer A. Henke
- Coachella Valley Mosquito and Vector Control District, Indio, CA, United States
| | - Kim Y. Hung
- Coachella Valley Mosquito and Vector Control District, Indio, CA, United States
| | - Jeremy Wittie
- Coachella Valley Mosquito and Vector Control District, Indio, CA, United States
| | | | - Chris Sumner
- Yuma County Pest Abatement District, Yuma, AZ, United States
| | - Martha Ruedas
- Yuma County Pest Abatement District, Yuma, AZ, United States
| | - Vivek Raman
- Southern Nevada Health District, Las Vegas, NV, United States
| | - Nicole Seaton
- Southern Nevada Health District, Las Vegas, NV, United States
| | - William Bendik
- Southern Nevada Health District, Las Vegas, NV, United States
| | | | - Krystal Sheridan
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
- Translational Genomics Research Institute, Flagstaff, AZ, United States
| | - Heather Centner
- Translational Genomics Research Institute, Flagstaff, AZ, United States
| | - Darrin Lemmer
- Translational Genomics Research Institute, Flagstaff, AZ, United States
| | - Viacheslav Fofanov
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Kirk Smith
- Vector Control Division, Maricopa County Environmental Services Department, Phoenix, AZ, United States
| | - James Will
- Vector Control Division, Maricopa County Environmental Services Department, Phoenix, AZ, United States
| | - John Townsend
- Vector Control Division, Maricopa County Environmental Services Department, Phoenix, AZ, United States
| | - Jeffrey T. Foster
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Paul S. Keim
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
- Translational Genomics Research Institute, Flagstaff, AZ, United States
| | | | - Crystal M. Hepp
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
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6
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Wang J, Fang X, Wang D, Xiao Y. Effect of intravenous thrombolysis with alteplase on clinical efficacy, inflammatory factors, and neurological function in patients with acute cerebral infarction. Braz J Med Biol Res 2021; 54:e10000. [PMID: 33729386 PMCID: PMC7959170 DOI: 10.1590/1414-431x202010000] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Accepted: 11/17/2020] [Indexed: 11/21/2022] Open
Abstract
This study aimed to explore the effect of intravenous thrombolysis with alteplase on clinical efficacy, inflammatory factors, and neurological function in patients with acute cerebral infarction. A total of 120 patients with acute cerebral infarction were divided into two groups by the random number table method, with 60 patients in each group: observation group (intravenous thrombolysis with alteplase) and control group (intravenous thrombolysis with batroxobin). The clinical efficacy after a 14-day treatment was observed. Serum C-reactive protein (CRP), tumor necrosis factor α (TNF-α), interleukin-6 (IL-6), CD62p, GMP-140, and neuron-specific enolase (NSE) were measured. Scores of National Institutes of Health Stroke Scale (NIHSS), Mini-Mental State Examination (MMSE), and Montreal Cognitive Assessment (MoCA) were determined. The total effective rate in the observation group was 81.67%, which was higher than the 61.67% in the control group (P<0.05). The improvement of inflammatory factors (CRP, TNF-α, IL-6, CD62p, GMP-140, and NSE), NIHSS, MMSE, and MoCA in the observation group was superior to that in the control group (all P<0.05). The modified Rankin scale at three months after hospital discharge in the observation group was lower than that in the control group (P<0.01). Intravenous thrombolysis with alteplase for acute cerebral infarction can enhance the clinical efficacy, alleviate inflammatory response and brain injury, and improve cognitive function, which is worthy of further clinical application and study.
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Affiliation(s)
- Jinhua Wang
- Department of Neurology, The People's Hospital of Beilun District, Beilun Branch Hospital of The First Affiliated Hospital, Zhejiang University School of Medicine, Ningbo, Zhejiang Province, China
| | - Xia Fang
- Department of Gynecology, The People's Hospital of Beilun District, Beilun Branch Hospital of The First Affiliated Hospital, Zhejiang University School of Medicine, Ningbo, Zhejiang Province, China
| | - Dongliang Wang
- Department of Neurology, The People's Hospital of Beilun District, Beilun Branch Hospital of The First Affiliated Hospital, Zhejiang University School of Medicine, Ningbo, Zhejiang Province, China
| | - Yuan Xiao
- Department of Neurology, The People's Hospital of Beilun District, Beilun Branch Hospital of The First Affiliated Hospital, Zhejiang University School of Medicine, Ningbo, Zhejiang Province, China
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7
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de Alcantara BN, Imbeloni AA, de Brito Simith Durans D, de Araújo MTF, do Rosário Moutinho da Cruz E, de Carvalho CAM, de Mendonça MHR, de Sousa JR, Moraes AF, Filho AJM, de Lourdes Gomes Lima M, Neto OPA, Chiang JO, de Azevedo Scalercio SRR, Carneiro LA, Quaresma JAS, da Costa Vasconcelos PF, de Almeida Medeiros DB. Histopathological lesions of congenital Zika syndrome in newborn squirrel monkeys. Sci Rep 2021; 11:6099. [PMID: 33731800 PMCID: PMC7971060 DOI: 10.1038/s41598-021-85571-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 02/18/2021] [Indexed: 12/14/2022] Open
Abstract
The absence of an adequate animal model for studies has limited the understanding of congenital Zika syndrome (CZS) in humans during the outbreak in America. In this study, we used squirrel monkeys (Saimiri collinsi), a neotropical primate (which mimics the stages of human pregnancy), as a model of Zika virus (ZIKV) infection. Seven pregnant female squirrel monkeys were experimentally infected at three different gestational stages, and we were able reproduce a broad range of clinical manifestations of ZIKV lesions observed in newborn humans. Histopathological and immunohistochemical analyses of early-infected newborns (2/4) revealed damage to various areas of the brain and ZIKV antigens in the cytoplasm of neurons and glial cells, indicative of CZS. The changes caused by ZIKV infection were intrauterine developmental delay, ventriculomegaly, simplified brain gyri, vascular impairment and neuroprogenitor cell dysfunction. Our data show that the ZIKV infection outcome in squirrel monkeys is similar to that in humans, indicating that this model can be used to help answer questions about the effect of ZIKV infection on neuroembryonic development and the morphological changes induced by CZS.
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Affiliation(s)
- Bianca Nascimento de Alcantara
- Post-Graduate Programme in Virology, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Aline Amaral Imbeloni
- National Primate Centre, Evandro Chagas Institute, Highway BR-316, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Darlene de Brito Simith Durans
- Department of Arbovirology and Haemorrhagic Fevers, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | | | | | - Carlos Alberto Marques de Carvalho
- Department of Arbovirology and Haemorrhagic Fevers, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil.,Pará State University, 2623 Perebebuí Lane, Belém, Pará, 66095-662, Brazil
| | | | - Jorge Rodrigues de Sousa
- Department of Arbovirology and Haemorrhagic Fevers, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Adriana Freitas Moraes
- Department of Arbovirology and Haemorrhagic Fevers, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Arnaldo Jorge Martins Filho
- Department of Pathology, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Maria de Lourdes Gomes Lima
- Department of Pathology, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Orlando Pereira Amador Neto
- Department of Pathology, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Jannifer Oliveira Chiang
- Department of Arbovirology and Haemorrhagic Fevers, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil
| | | | - Liliane Almeida Carneiro
- National Primate Centre, Evandro Chagas Institute, Highway BR-316, km 7, Ananindeua, Pará, 67030-000, Brazil
| | - Juarez Antônio Simões Quaresma
- Department of Pathology, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil.,Pará State University, 2623 Perebebuí Lane, Belém, Pará, 66095-662, Brazil
| | - Pedro Fernando da Costa Vasconcelos
- Post-Graduate Programme in Virology, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil.,Department of Arbovirology and Haemorrhagic Fevers, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil.,Pará State University, 2623 Perebebuí Lane, Belém, Pará, 66095-662, Brazil
| | - Daniele Barbosa de Almeida Medeiros
- Post-Graduate Programme in Virology, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil. .,Department of Arbovirology and Haemorrhagic Fevers, Evandro Chagas Institute, BR-316 Highway, km 7, Ananindeua, Pará, 67030-000, Brazil.
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Carmo RLD, Alves Simão AK, Amaral LLFD, Inada BSY, Silveira CF, Campos CMDS, Freitas LF, Bonadio V, Marussi VHR. Neuroimaging of Emergent and Reemergent Infections. Radiographics 2020; 39:1649-1671. [PMID: 31589575 DOI: 10.1148/rg.2019190020] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Infectious diseases emerge and reemerge over the years, and many of them can cause neurologic disease. Several factors contribute to the emergence and reemergence of these conditions, including human population growth, an increase in international travel, the geographic expansion of recognized pathogens to areas where they were previously nonendemic, and greater contact with wild animal reservoirs. The antivaccination social movement has played an important role in the reemergence of infectious diseases, especially some viral conditions. The authors review different viral (arboviruses such as dengue, chikungunya, and Zika virus; enterovirus 71; measles; and influenza), bacterial (syphilis, Lyme disease, and listeriosis), and parasitic (Chagas disease) diseases, focusing primarily on their neurologic complications. Although there are several additional infectious diseases with central nervous system manifestations that could be classified as emergent or reemergent, those listed here are the most relevant from an epidemiologic standpoint and are representative of important public health issues on all continents. The infections caused by these pathogens often show a variety of neuroimaging patterns that can be identified at CT and MRI, and radiology is central to the diagnosis and follow-up of such conditions. Given the increasing relevance of emerging and reemerging infections in clinical practice and public health scenarios, radiologists should be familiar with these infections. Online supplemental material is available for this article. ©RSNA, 2019.
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Affiliation(s)
- Rafael Lourenço do Carmo
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
| | - Aylla Keiner Alves Simão
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
| | - Lázaro Luís Faria do Amaral
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
| | - Bruno Shigueo Yonekura Inada
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
| | - Camila Filardi Silveira
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
| | | | - Leonardo Furtado Freitas
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
| | - Victor Bonadio
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
| | - Victor Hugo Rocha Marussi
- From the Department of Neuroradiology, A Beneficência Portuguesa de São Paulo, R. Maestro Cardim 769, São Paulo, SP 01323-001, Brazil
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9
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Distinct New York City Aedes albopictus Mosquito Populations Display Differences in Salivary Gland Protein D7 Diversity and Chikungunya Virus Replication. Viruses 2020; 12:v12070698. [PMID: 32605312 PMCID: PMC7411853 DOI: 10.3390/v12070698] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/19/2020] [Accepted: 06/26/2020] [Indexed: 12/14/2022] Open
Abstract
In an increasingly interconnected world, the exposure and subsequent spread of emergent viruses has become inevitable. This is particularly true for Aedes (Ae.) mosquito-vectored viruses, whose range has increased over the past decade from tropical to temperate regions. However, it is unclear if all populations of Ae. mosquitoes in temperate New York City are able to successfully replicate and transmit arboviruses. To answer this question, we reared Ae. albopictus mosquitoes living in a temperate climate from three locations in New York City. We first sequenced the salivary antiviral protein D7 from individual mosquitoes in each population and found single nucleotide variants that are both shared and unique for each Ae. albopictus population. We then fed each population chikungunya virus (CHIKV) via an artificial blood meal. All three mosquito populations could be infected with CHIKV, yet viral titers differed between populations at 7 days post infection. Moreover, we found that these mosquitoes could transmit CHIKV to mice, and that virus RNA reached the saliva as early as two days post infection. Upon sequencing of the saliva CHIKV genomic RNA, we found mutations at sites correlated with increased transmission and virulence. These studies show that NYC Ae. albopictus populations can be infected with and transmit CHIKV, CHIKV is able to evolve in these mosquitoes, and that host salivary factors display population-specific diversity. Taken together, these studies highlight the need to study how distinct mosquito populations control viral infections, both at the virus and host level.
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10
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Swetnam DM, Stuart JB, Young K, Maharaj PD, Fang Y, Garcia S, Barker CM, Smith K, Godsey MS, Savage HM, Barton V, Bolling BG, Duggal N, Brault AC, Coffey LL. Movement of St. Louis encephalitis virus in the Western United States, 2014- 2018. PLoS Negl Trop Dis 2020; 14:e0008343. [PMID: 32520944 PMCID: PMC7307790 DOI: 10.1371/journal.pntd.0008343] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 06/22/2020] [Accepted: 05/02/2020] [Indexed: 11/22/2022] Open
Abstract
St. Louis encephalitis virus (SLEV) is a flavivirus that circulates in an enzootic cycle between birds and mosquitoes and can also infect humans to cause febrile disease and sometimes encephalitis. Although SLEV is endemic to the United States, no activity was detected in California during the years 2004 through 2014, despite continuous surveillance in mosquitoes and sentinel chickens. In 2015, SLEV-positive mosquito pools were detected in Maricopa County, Arizona, concurrent with an outbreak of human SLEV disease. SLEV-positive mosquito pools were also detected in southeastern California and Nevada in summer 2015. From 2016 to 2018, SLEV was detected in mosquito pools throughout southern and central California, Oregon, Idaho, and Texas. To understand genetic relatedness and geographic dispersal of SLEV in the western United States since 2015, we sequenced four historical genomes (3 from California and 1 from Louisiana) and 26 contemporary SLEV genomes from mosquito pools from locations across the western US. Bayesian phylogeographic approaches were then applied to map the recent spread of SLEV. Three routes of SLEV dispersal in the western United States were identified: Arizona to southern California, Arizona to Central California, and Arizona to all locations east of the Sierra Nevada mountains. Given the topography of the Western United States, these routes may have been limited by mountain ranges that influence the movement of avian reservoirs and mosquito vectors, which probably represents the primary mechanism of SLEV dispersal. Our analysis detected repeated SLEV introductions from Arizona into southern California and limited evidence of year-to-year persistence of genomes of the same ancestry. By contrast, genetic tracing suggests that all SLEV activity since 2015 in central California is the result of a single persistent SLEV introduction. The identification of natural barriers that influence SLEV dispersal enhances our understanding of arbovirus ecology in the western United States and may also support regional public health agencies in implementing more targeted vector mitigation efforts to protect their communities more effectively. Following the detection of West Nile virus in the United States, evidence of the historically endemic and closely related virus, St. Louis encephalitis virus (SLEV), dropped nationwide. However, in 2015, a novel genotype of SLEV, previously restricted to Argentina, was identified as the etiological agent of an outbreak of neurological disease in Arizona, United States. Since that time, the genotype has expanded throughout the Western United States, including into California, Nevada, Texas, Idaho, and Oregon. In this study, samples containing SLEV, provided by public health and mosquito abatement agencies, were sequenced and used in phylogenetic analyses to infer patterns of SLEV movement. Three independent routes of SLEV dispersal were identified: Arizona to Southern California, Arizona to Central California, and Arizona to all locations east of the Sierra Nevada mountains. The Sierra Nevada mountains and the Transverse Ranges appear to separate the three routes of SLEV movement, suggesting that geographic features may act as barriers to virus dispersal. Identification of patterns of SLEV dispersal can support regional public health agencies in improving vector mitigation efforts to protect their communities more effectively.
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Affiliation(s)
- Daniele M. Swetnam
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Jackson B. Stuart
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Katherine Young
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Payal D. Maharaj
- Division of Vector-borne Diseases, Centers for Disease Control, Fort Collins, Colorado, United States of America
| | - Ying Fang
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Sandra Garcia
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Christopher M. Barker
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Kirk Smith
- Maricopa County Environmental Services Department, Phoenix, Arizona, United States of America
| | - Marvin S. Godsey
- Division of Vector-borne Diseases, Centers for Disease Control, Fort Collins, Colorado, United States of America
| | - Harry M. Savage
- Division of Vector-borne Diseases, Centers for Disease Control, Fort Collins, Colorado, United States of America
| | - Vonnita Barton
- Idaho Bureau of Laboratories, Boise, Idaho, United States of America
| | - Bethany G. Bolling
- Laboratory Services Section, Texas Department of State Health Services, Austin, Texas, United States of America
| | - Nisha Duggal
- Department of Molecular Biology, College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, United States of America
| | - Aaron C. Brault
- Division of Vector-borne Diseases, Centers for Disease Control, Fort Collins, Colorado, United States of America
| | - Lark L. Coffey
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
- * E-mail:
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11
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Liu ZY, Qin CF. Structure and function of cis-acting RNA elements of flavivirus. Rev Med Virol 2019; 30:e2092. [PMID: 31777997 DOI: 10.1002/rmv.2092] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 10/12/2019] [Accepted: 10/20/2019] [Indexed: 12/23/2022]
Abstract
The genus Flavivirus is a group of single-stranded, positive-sense RNA viruses that includes numerous human pathogens with global impact, such as dengue virus (DENV), yellow fever virus (YFV), West Nile virus (WNV), and Zika virus (ZIKV). The approximately 11-kilobase genome is flanked by highly structured untranslated regions (UTRs), which contain various cis-acting RNA elements with unique structures and functions. Moreover, local RNA elements circularize the genome non-covalently through long-range interactions. Interestingly, many flavivirus cis-acting RNA elements contain group-specific motifs or are specific for the given phylogenetic groups, suggesting their potential association with flavivirus evolution and diversification. In this review, we summarize recent advances about the structure and function of cis-acting RNA elements in flavivirus genomes and highlight the potential implications for flavivirus evolution. Finally, the scientific questions remained to be answered in the field are also discussed.
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Affiliation(s)
- Zhong-Yu Liu
- Department of Virology, State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Beijing, China.,School of Medicine Shenzhen, Sun Yat-sen University, Guangzhou, China.,The No. 8 People's Hospital, Guangzhou Medical University, Guangzhou, China
| | - Cheng-Feng Qin
- Department of Virology, State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Beijing, China.,The No. 8 People's Hospital, Guangzhou Medical University, Guangzhou, China
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12
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Reisen WK, Wheeler SS. Overwintering of West Nile Virus in the United States. JOURNAL OF MEDICAL ENTOMOLOGY 2019; 56:1498-1507. [PMID: 31549726 DOI: 10.1093/jme/tjz070] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Indexed: 06/10/2023]
Abstract
The establishment of a tropical virus such as West Nile (WNV; Flaviviridae: Flavivirus) within the temperate latitudes of the continental United States was unexpected and perhaps contingent, in part, upon the ability of this invasive virus to persist during winter when temperatures become too cold for replication and vector mosquito gonotrophic activity. Our Forum article reviews research examining possible overwintering mechanisms that include consistent reintroduction and local persistence in vector mosquitoes and avian hosts, mostly using examples from research conducted in California. We conclude that the transmission of WNV involves so many vectors and hosts within different landscapes that multiple overwintering pathways are possible and collectively may be necessary to allow this virus to overwinter consistently within the United States.
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Affiliation(s)
- William K Reisen
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, CA
| | - Sarah S Wheeler
- Sacramento-Yolo Mosquito and Vector Control District, Elk Grove, CA
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13
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Curren EJ, Lindsey NP, Fischer M, Hills SL. St. Louis Encephalitis Virus Disease in the United States, 2003-2017. Am J Trop Med Hyg 2019; 99:1074-1079. [PMID: 30182919 DOI: 10.4269/ajtmh.18-0420] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
St. Louis encephalitis virus (SLEV), an arthropod-borne flavivirus, can cause disease presentations ranging from mild febrile illness through severe encephalitis. We reviewed U.S. national SLEV surveillance data for 2003 through 2017, including human disease cases and nonhuman infections. Over the 15-year period, 198 counties from 33 states and the District of Columbia reported SLEV activity; 94 (47%) of those counties reported SLEV activity only in nonhuman species. A total of 193 human cases of SLEV disease were reported, including 148 cases of neuroinvasive disease. A median of 10 cases were reported per year. The national average annual incidence of reported neuroinvasive disease cases was 0.03 per million. States with the highest average annual incidence of reported neuroinvasive disease cases were Arkansas, Arizona, and Mississippi. No large outbreaks occurred during the reporting period. The most commonly reported clinical syndromes were encephalitis (N = 116, 60%), febrile illness (N = 35, 18%), and meningitis (N = 25, 13%). Median age of cases was 57 years (range 2-89 years). The case fatality rate was 6% (11/193) and all deaths were among patients aged > 45 years with neuroinvasive disease. Nonhuman surveillance data indicated wider SLEV activity in California, Nevada, and Florida than the human data alone suggested. Prevention depends on community efforts to reduce mosquito populations and personal protective measures to decrease exposure to mosquitoes.
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Affiliation(s)
- Emily J Curren
- Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia.,Arboviral Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado
| | - Nicole P Lindsey
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado
| | - Marc Fischer
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado
| | - Susan L Hills
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado
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14
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Barba M, Fairbanks EL, Daly JM. Equine viral encephalitis: prevalence, impact, and management strategies. VETERINARY MEDICINE (AUCKLAND, N.Z.) 2019; 10:99-110. [PMID: 31497528 PMCID: PMC6689664 DOI: 10.2147/vmrr.s168227] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 07/08/2019] [Indexed: 12/11/2022]
Abstract
Members of several different virus families cause equine viral encephalitis, the majority of which are arthropod-borne viruses (arboviruses) with zoonotic potential. The clinical signs caused are rarely pathognomonic; therefore, a clinical diagnosis is usually presumptive according to the geographical region. However, recent decades have seen expansion of the geographical range and emergence in new regions of numerous viral diseases. In this context, this review presents an overview of the prevalence and distribution of the main viral causes of equine encephalitis and discusses their impact and potential approaches to limit their spread.
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Affiliation(s)
- Marta Barba
- Veterinary Faculty, Universidad Cardenal Herrera-CEU, CEU Universities, Valencia, Spain
| | - Emma L Fairbanks
- School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, UK
| | - Janet M Daly
- School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, UK
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15
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Abstract
In the western United States, this virus may have been mediated via migrating infected birds from southern South America, where it reemerged most recently in 2002. We summarize and analyze historical and current data regarding the reemergence of St. Louis encephalitis virus (SLEV; genus Flavivirus) in the Americas. Historically, SLEV caused encephalitis outbreaks in the United States; however, it was not considered a public health concern in the rest of the Americas. After the introduction of West Nile virus in 1999, activity of SLEV decreased considerably in the United States. During 2014–2015, SLEV caused a human outbreak in Arizona and caused isolated human cases in California in 2016 and 2017. Phylogenetic analyses indicate that the emerging SLEV in the western United States is related to the epidemic strains isolated during a human encephalitis outbreak in Córdoba, Argentina, in 2005. Ecoepidemiologic studies suggest that the emergence of SLEV in Argentina was caused by the introduction of a more pathogenic strain and increasing populations of the eared dove (amplifying host).
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MESH Headings
- Communicable Diseases, Emerging/epidemiology
- Communicable Diseases, Emerging/history
- Communicable Diseases, Emerging/transmission
- Communicable Diseases, Emerging/virology
- Disease Outbreaks
- Encephalitis Virus, St. Louis/classification
- Encephalitis Virus, St. Louis/genetics
- Encephalitis Virus, St. Louis/physiology
- Encephalitis, St. Louis/epidemiology
- Encephalitis, St. Louis/history
- Encephalitis, St. Louis/transmission
- Encephalitis, St. Louis/virology
- Geography, Medical
- History, 20th Century
- History, 21st Century
- Humans
- Phylogeny
- South America/epidemiology
- United States/epidemiology
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16
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Hepp CM. Towards Translational Epidemiology: Next-Generation Sequencing and Phylogeography as Epidemiological Mainstays. mSystems 2019; 4:e00119-19. [PMID: 31186309 PMCID: PMC6584875 DOI: 10.1128/msystems.00119-19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 04/24/2019] [Indexed: 11/20/2022] Open
Abstract
Next-generation sequencing, coupled with the development of user-friendly software, has achieved a level of accessibility that is revolutionizing the way we approach epidemiological investigations. We can sequence pathogen genomes and conduct phylogenetic analyses to assess transmission, identify from which country or city a pathogen originated, or which contaminated potluck item resulted in widespread foodborne illness. However, until recently, these types of studies have been rarities, limited to specific investigations usually conducted over the short term. Given the feasibility and realized public health benefits of ascertaining pathogen relationships, federal, state, and county agencies are building their sequencing capacities, either through acquisition of equipment or collaborative activities. In this perspective, I detail research projects that our group collaborates on with county and state public health agencies, where the objective is to identify pathogen source locations with the longer-term goal of implementing proactive interventions.
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Affiliation(s)
- Crystal M Hepp
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, Arizona, USA
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, Arizona, USA
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17
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Hannon ER, Jackson KC, Biggerstaff BJ, Raman V, Komar N. Bloodmeal Host Selection of Culex quinquefasciatus (Diptera: Culicidae) in Las Vegas, Nevada, United States. JOURNAL OF MEDICAL ENTOMOLOGY 2019; 56:603-608. [PMID: 30668743 DOI: 10.1093/jme/tjy237] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Indexed: 06/09/2023]
Abstract
St. Louis encephalitis virus (SLEV) and West Nile virus (WNV) have recently emerged in the southwestern United States. Surveillance for arboviruses in Las Vegas, NV, detected a surge of SLEV activity in the southern house mosquito (Culex quinquefasciatus Say) during 2016. To identify candidate avian amplifiers, we assessed the identification, viral infection, and immune status of vertebrate hosts for 195 blood-engorged Cx. quinquefasciatus mosquitoes collected in August and September 2016. Bloodmeals were identified from 164 engorged abdomens, representing 19 species of birds and three species of mammals. No SLEV or WNV viremia was detected, but one mosquito tested positive for Culex flavivirus. House finch (Haemorhous mexicanus) (Muller) was the most common bloodmeal, followed by domestic chicken (Gallus gallus) (Linnaeus), American robin (Turdus migratorius) L., house sparrow (Passer domesticus) (L.), great-tailed grackle (Quiscalus mexicanus) (Gmelin), northern mockingbird (Mimus polyglottos) (L.) and mourning dove (Zenaida macroura) (L.). SLEV-reactive antibodies were detected in six identified bloodmeals and WNV-reactive antibodies were detected in 33. House sparrow and house finch were the most likely hosts to show previous exposure to SLEV and WNV, respectively. Over-utilization by Cx. quinquefasciatus for bloodmeal hosts was observed primarily among robin, finch and sparrow, all species that roost communally. House finch stands out as a candidate important amplifier for both SLEV and WNV because of its preference by mosquito vectors, and high competence for closely related virus strains. While implicated in previous outbreaks as an important mosquito vector, Cx. quinquefasciatus feeds infrequently on mammals in Las Vegas, indicating a low risk for bridge transmission to humans.
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Affiliation(s)
- Emily R Hannon
- Arbovirus Diseases Branch, Division of Vector Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Katelin C Jackson
- Arbovirus Diseases Branch, Division of Vector Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Brad J Biggerstaff
- Arbovirus Diseases Branch, Division of Vector Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Vivek Raman
- Southern Nevada Health District, Las Vegas, NV
| | - Nicholas Komar
- Arbovirus Diseases Branch, Division of Vector Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
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18
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Sadeghi M, Altan E, Deng X, Barker CM, Fang Y, Coffey LL, Delwart E. Virome of > 12 thousand Culex mosquitoes from throughout California. Virology 2018; 523:74-88. [DOI: 10.1016/j.virol.2018.07.029] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/25/2018] [Accepted: 07/26/2018] [Indexed: 12/25/2022]
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19
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Steiner CD, Riemersma KK, Stuart JB, Singapuri A, Lothrop HD, Coffey LL. Scented Sugar Baits Enhance Detection of St. Louis Encephalitis and West Nile Viruses in Mosquitoes in Suburban California. JOURNAL OF MEDICAL ENTOMOLOGY 2018; 55:1307-1318. [PMID: 29718284 PMCID: PMC6113650 DOI: 10.1093/jme/tjy064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Indexed: 05/28/2023]
Abstract
Scented sugar baits deployed in California deserts detected early West Nile virus (WNV) transmission by mosquitoes, representing a potential improvement to conventional arbovirus surveillance that relies heavily on infection rates in mosquito pools. In this study, we expanded deployment of scented sugar baits into suburban Sacramento and Yolo (2015, 2016) and Riverside Counties (2016), California. The goal of the study was to determine whether scented sugar baits detect WNV and St. Louis encephalitis virus (SLEV) concurrent with mosquito infections in trapped pools in areas of high human density. Between 8 and 10% of sugar baits were WNV RNA positive in both study years across the three counties. In Riverside County, where SLEV re-emerged in 2015, 1% of sugar baits were SLEV positive in 2016. Rates of sugar bait positives were at least 100 times higher than infection rates in trapped mosquitoes in the same districts. The prevalence of sugar bait positives varied temporally and did not coincide with infections in mosquitoes collected at the same sites each week. WNV RNA positive sugar baits were detected up to 2 wk before and after concurrent surveillance detected infection in mosquito pools at the same sites. Sugar baits also detected WNV in Riverside County at locations where no WNV activity was detected in mosquito pools. Sugar baits generated between 0.8 and 1.2 WNV positives per $1,000 and can be more economical than carbon dioxide baited traps that produce 0.8 positives per $1,000. These results indicate that the sugar bait approach enhances conventional arbovirus surveillance in mosquitoes in suburban California.
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Affiliation(s)
- Cody D Steiner
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA
| | - Kasen K Riemersma
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA
| | - Jackson B Stuart
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA
| | - Anil Singapuri
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA
| | - Hugh D Lothrop
- Coachella Valley Mosquito and Vector Control District, Riverside County, CA
| | - Lark L Coffey
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA
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20
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Rivarola ME, de Olmos S, Albrieu-Llinás G, Tauro LB, Gorosito-Serrán M, Konigheim BS, Contigiani MS, Gruppi A. Neuronal Degeneration in Mice Induced by an Epidemic Strain of Saint Louis Encephalitis Virus Isolated in Argentina. Front Microbiol 2018; 9:1181. [PMID: 29930541 PMCID: PMC6000731 DOI: 10.3389/fmicb.2018.01181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 05/15/2018] [Indexed: 11/13/2022] Open
Abstract
Saint Louis encephalitis virus (SLEV) is a neglected flavivirus that causes severe neurological disorders. The epidemic strain of SLEV, CbaAr-4005, isolated during an outbreak in Córdoba city (Argentina), causes meningitis and encephalitis associated with neurological symptoms in a murine experimental model. Here, we identified the affected brain areas and the damage triggered by this neurotropic arbovirus. We performed a detailed analysis of brain neurodegeneration associated with CbaAr-4005 SLEV infection in mice. The motor cortex, corpus striatum and cerebellum were the most affected structures. Neurodegeneration was also found in the olfactory bulb, thalamus, hypothalamus, hippocampus, and hindbrain. SLEV infection triggered brain cell apoptosis as well as somatodendritic and terminal degeneration. In addition, we observed massive excitotoxic-like degeneration in many cortical structures. Apoptosis was also detected in the neuroblastoma cell line N2a cultured with SLEV. The results evidenced that SLEV CbaAr-4005 infection induced severe degenerative alterations within the central nervous system of infected mice, providing new information about the targets of this flavivirus infection.
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Affiliation(s)
- María E Rivarola
- Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella", Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Soledad de Olmos
- Laboratorio de Neuroanatomía e Histología Experimental, Instituto de Investigación Médica Mercedes y Martín Ferreyra - INIMEC-CONICET-UNC, Córdoba, Argentina
| | - Guillermo Albrieu-Llinás
- Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella", Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Laura B Tauro
- Instituto Nacional de Medicina Tropical, Ministerio de Salud, Puerto Iguazú, Argentina
| | - Melisa Gorosito-Serrán
- Inmunología, Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Brenda S Konigheim
- Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella", Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Marta S Contigiani
- Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella", Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Adriana Gruppi
- Inmunología, Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
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21
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Chiu CY, Coffey LL, Murkey J, Symmes K, Sample HA, Wilson MR, Naccache SN, Arevalo S, Somasekar S, Federman S, Stryke D, Vespa P, Schiller G, Messenger S, Humphries R, Miller S, Klausner JD. Diagnosis of Fatal Human Case of St. Louis Encephalitis Virus Infection by Metagenomic Sequencing, California, 2016. Emerg Infect Dis 2018; 23:1964-1968. [PMID: 28930022 PMCID: PMC5621550 DOI: 10.3201/eid2310.161986] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We used unbiased metagenomic next-generation sequencing to diagnose a fatal case of meningoencephalitis caused by St. Louis encephalitis virus in a patient from California in September 2016. This case is associated with the recent 2015–2016 reemergence of this virus in the southwestern United States.
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MESH Headings
- Aged
- Bronchopneumonia/diagnosis
- Bronchopneumonia/pathology
- California
- Encephalitis Virus, St. Louis/classification
- Encephalitis Virus, St. Louis/genetics
- Encephalitis Virus, St. Louis/isolation & purification
- Encephalitis, St. Louis/cerebrospinal fluid
- Encephalitis, St. Louis/diagnosis
- Encephalitis, St. Louis/pathology
- Encephalitis, St. Louis/virology
- Fatal Outcome
- Genome, Viral
- High-Throughput Nucleotide Sequencing
- Humans
- Lymphoma, Mantle-Cell/diagnosis
- Lymphoma, Mantle-Cell/pathology
- Male
- Metagenome
- Phylogeny
- Reverse Transcriptase Polymerase Chain Reaction
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22
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Díaz A, Flores FS, Quaglia AI, Contigiani MS. Evaluation of Argentinean Bird Species as Amplifying Hosts for St. Louis Encephalitis Virus (Flavivirus, Flaviviridae). Am J Trop Med Hyg 2018; 99:216-221. [PMID: 29761767 DOI: 10.4269/ajtmh.17-0856] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
St.Louis encephalitis virus (SLEV) is an emerging human pathogen flavivirus in Argentina. Recently, it has reemerged in the United States. We evaluated the role as amplifying host of six resident bird species and analyzed their capacity as host during the 2005 encephalitis outbreak of SLEV in Córdoba. Eared Dove, Picui Ground Dove, and House Sparrow were the three species with highest host competence index. At a city level, Eared Dove and Picui Ground Dove were the most important amplifying hosts during the 2005 SLEV human outbreak in Córdoba city. This finding highlighted important differences in the SLEV ecology between Argentina and the United States. Characterizing and evaluating the SLEV hosts contribute to our knowledge about its ecology and could help us to understand the causes that promote its emergence as a human pathogen in South America.
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Affiliation(s)
- Adrián Díaz
- Instituto de Investigaciones Biológicas y Tecnológicas, CONICET-Universidad Nacional de Córdoba, Córdoba, Argentina.,Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Fernando S Flores
- Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Agustín I Quaglia
- Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Marta S Contigiani
- Laboratorio de Arbovirus, Instituto de Virología "Dr. J. M. Vanella," Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
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Maharaj PD, Bosco-Lauth AM, Langevin SA, Anishchenko M, Bowen RA, Reisen WK, Brault AC. West Nile and St. Louis encephalitis viral genetic determinants of avian host competence. PLoS Negl Trop Dis 2018; 12:e0006302. [PMID: 29447156 PMCID: PMC5831645 DOI: 10.1371/journal.pntd.0006302] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 02/28/2018] [Accepted: 02/05/2018] [Indexed: 11/17/2022] Open
Abstract
West Nile virus (WNV) and St. Louis encephalitis (SLEV) virus are enzootically maintained in North America in cycles involving the same mosquito vectors and similar avian hosts. However, these viruses exhibit dissimilar viremia and virulence phenotypes in birds: WNV is associated with high magnitude viremias that can result in mortality in certain species such as American crows (AMCRs, Corvus brachyrhynchos) whereas SLEV infection yields lower viremias that have not been associated with avian mortality. Cross-neutralization of these viruses in avian sera has been proposed to explain the reduced circulation of SLEV since the introduction of WNV in North America; however, in 2015, both viruses were the etiologic agents of concurrent human encephalitis outbreaks in Arizona, indicating the need to re-evaluate host factors and cross-neutralization responses as factors potentially affecting viral co-circulation. Reciprocal chimeric WNV and SLEV viruses were constructed by interchanging the pre-membrane (prM)-envelope (E) genes, and viruses subsequently generated were utilized herein for the inoculation of three different avian species: house sparrows (HOSPs; Passer domesticus), house finches (Haemorhous mexicanus) and AMCRs. Cross-protective immunity between parental and chimeric viruses were also assessed in HOSPs. Results indicated that the prM-E genes did not modulate avian replication or virulence differences between WNV and SLEV in any of the three avian species. However, WNV-prME proteins did dictate cross-protective immunity between these antigenically heterologous viruses. Our data provides further evidence of the important role that the WNV / SLEV viral non-structural genetic elements play in viral replication, avian host competence and virulence. Since the identification of West Nile virus (WNV) in North America in 1999, St. Louis encephalitis virus (SLEV) cases declined rapidly. Both viruses utilize similar avian hosts and vectors for maintenance of transmission cycles; however, they present different phenotypes in both vector and avian host. In birds, WNV develops high viremias and elicits mortality whereas SLEV has not been associated with avian virulence. West Nile viral non-structural genetic elements have been demonstrated herein to dictate higher viremias in competent avian hosts and virulence in AMCRs. In contrast, non-structural SLEV elements previously have been shown to dictate increased oral infectivity in Culex mosquitoes, likely as a compensation for the lower viremias generated by SLEV. These findings coupled with the co-circulation of WNV and SLEV in Arizona in 2015 demonstrate that pre-existing flaviviral immunity does not necessarily preclude concurrent circulation of these viruses.
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Affiliation(s)
- Payal D Maharaj
- Division of Vector-Borne Diseases, Arboviral Disease Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado, United States of America.,Center for Vectorborne Disease Research and Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - Angela M Bosco-Lauth
- Division of Vector-Borne Diseases, Arboviral Disease Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado, United States of America.,Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, United States of America
| | - Stanley A Langevin
- Center for Vectorborne Disease Research and Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - Michael Anishchenko
- Division of Vector-Borne Diseases, Arboviral Disease Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado, United States of America.,Center for Vectorborne Disease Research and Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - Richard A Bowen
- Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, United States of America
| | - William K Reisen
- Center for Vectorborne Disease Research and Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - Aaron C Brault
- Division of Vector-Borne Diseases, Arboviral Disease Branch, Centers for Disease Control and Prevention, Fort Collins, Colorado, United States of America.,Center for Vectorborne Disease Research and Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
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Gould E, Pettersson J, Higgs S, Charrel R, de Lamballerie X. Emerging arboviruses: Why today? One Health 2017; 4:1-13. [PMID: 28785601 PMCID: PMC5501887 DOI: 10.1016/j.onehlt.2017.06.001] [Citation(s) in RCA: 258] [Impact Index Per Article: 36.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 06/26/2017] [Accepted: 06/30/2017] [Indexed: 12/13/2022] Open
Abstract
The recent global (re)emergence of arthropod-borne viruses (arboviruses), such as chikungunya and Zika virus, was widely reported in the media as though it was a new phenomenon. This is not the case. Arboviruses and other human microbial pathogens have been (re)emerging for centuries. The major difference today is that arbovirus emergence and dispersion are more rapid and geographically extensive, largely due to intensive growth of global transportation systems, arthropod adaptation to increasing urbanisation, our failure to contain mosquito population density increases and land perturbation. Here we select examples of (re)emerging pathogenic arboviruses and explain the reasons for their emergence and different patterns of dispersal, focusing particularly on the mosquito vectors which are important determinants of arbovirus emergence. We also attempt to identify arboviruses likely to (re)emerge in the future.
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Affiliation(s)
- Ernest Gould
- Emergence des Pathologies Virales (EPV: Aix-Marseille Université-IRD 190-INSERM 1207-EHESP), Marseille, France
| | - John Pettersson
- Department of Infectious Disease Epidemiology and Modelling/Molecular Biology, Domain for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway.,Department of Medical Biochemistry and Microbiology (IMBIM), Zoonosis Science Center, Uppsala University, Uppsala, Sweden
| | - Stephen Higgs
- Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, United States.,KS Biosecurity Research Institute, Kansas State University, Manhattan, United States
| | - Remi Charrel
- Emergence des Pathologies Virales (EPV: Aix-Marseille Université-IRD 190-INSERM 1207-EHESP), Marseille, France.,Institut Hospitalo-Universitaire Méditerranée Infection, APHM Public Hospitals of Marseille, Marseille, France
| | - Xavier de Lamballerie
- Emergence des Pathologies Virales (EPV: Aix-Marseille Université-IRD 190-INSERM 1207-EHESP), Marseille, France.,Institut Hospitalo-Universitaire Méditerranée Infection, APHM Public Hospitals of Marseille, Marseille, France
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