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Humphreys JM, Pelzel-McCluskey AM, Shults PT, Velazquez-Salinas L, Bertram MR, McGregor BL, Cohnstaedt LW, Swanson DA, Scroggs SLP, Fautt C, Mooney A, Peters DPC, Rodriguez LL. Modeling the 2014-2015 Vesicular Stomatitis Outbreak in the United States Using an SEIR-SEI Approach. Viruses 2024; 16:1315. [PMID: 39205289 PMCID: PMC11359999 DOI: 10.3390/v16081315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2024] [Revised: 08/02/2024] [Accepted: 08/15/2024] [Indexed: 09/04/2024] Open
Abstract
Vesicular stomatitis (VS) is a vector-borne livestock disease caused by the vesicular stomatitis New Jersey virus (VSNJV). This study presents the first application of an SEIR-SEI compartmental model to analyze VSNJV transmission dynamics. Focusing on the 2014-2015 outbreak in the United States, the model integrates vertebrate hosts and insect vector demographics while accounting for heterogeneous competency within the populations and observation bias in documented disease cases. Key epidemiological parameters were estimated using Bayesian inference and Markov chain Monte Carlo (MCMC) methods, including the force of infection, effective reproduction number (Rt), and incubation periods. The model revealed significant underreporting, with only 10-24% of infections documented, 23% of which presented with clinical symptoms. These findings underscore the importance of including competence and imperfect detection in disease models to depict outbreak dynamics and inform effective control strategies accurately. As a baseline model, this SEIR-SEI implementation is intended to serve as a foundation for future refinements and expansions to improve our understanding of VS dynamics. Enhanced surveillance and targeted interventions are recommended to manage future VS outbreaks.
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Affiliation(s)
- John M. Humphreys
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan, KS 66502, USA; (L.V.-S.); (M.R.B.); (C.F.); (A.M.); (L.L.R.)
| | - Angela M. Pelzel-McCluskey
- Veterinary Services, Animal and Plant Health Inspection Service (APHIS), U.S. Department of Agriculture, Fort Collins, CO 80526, USA;
| | - Phillip T. Shults
- Arthropod-Borne Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, KS 66502, USA; (P.T.S.); (B.L.M.); (S.L.P.S.)
| | - Lauro Velazquez-Salinas
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan, KS 66502, USA; (L.V.-S.); (M.R.B.); (C.F.); (A.M.); (L.L.R.)
| | - Miranda R. Bertram
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan, KS 66502, USA; (L.V.-S.); (M.R.B.); (C.F.); (A.M.); (L.L.R.)
| | - Bethany L. McGregor
- Arthropod-Borne Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, KS 66502, USA; (P.T.S.); (B.L.M.); (S.L.P.S.)
| | - Lee W. Cohnstaedt
- Foreign Arthropod-Borne Animal Diseases Research Unit National Bio- and Agro-Defense Facility, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, KS 66502, USA;
| | - Dustin A. Swanson
- Center for Grain and Animal Health Research, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, KS 66502, USA;
| | - Stacey L. P. Scroggs
- Arthropod-Borne Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, KS 66502, USA; (P.T.S.); (B.L.M.); (S.L.P.S.)
| | - Chad Fautt
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan, KS 66502, USA; (L.V.-S.); (M.R.B.); (C.F.); (A.M.); (L.L.R.)
- Oak Ridge Institute for Science and Education (ORISE)-NBAF, Oak Ridge, TN 37831, USA
| | - Amber Mooney
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan, KS 66502, USA; (L.V.-S.); (M.R.B.); (C.F.); (A.M.); (L.L.R.)
- Oak Ridge Institute for Science and Education (ORISE)-NBAF, Oak Ridge, TN 37831, USA
| | - Debra P. C. Peters
- Office of National Programs, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705, USA;
| | - Luis L. Rodriguez
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan, KS 66502, USA; (L.V.-S.); (M.R.B.); (C.F.); (A.M.); (L.L.R.)
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Humphreys JM, Shults PT, Velazquez-Salinas L, Bertram MR, Pelzel-McCluskey AM, Pauszek SJ, Peters DPC, Rodriguez LL. Interrogating Genomes and Geography to Unravel Multiyear Vesicular Stomatitis Epizootics. Viruses 2024; 16:1118. [PMID: 39066280 PMCID: PMC11281362 DOI: 10.3390/v16071118] [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: 05/30/2024] [Revised: 07/07/2024] [Accepted: 07/09/2024] [Indexed: 07/28/2024] Open
Abstract
We conducted an integrative analysis to elucidate the spatial epidemiological patterns of the Vesicular Stomatitis New Jersey virus (VSNJV) during the 2014-15 epizootic cycle in the United States (US). Using georeferenced VSNJV genomics data, confirmed vesicular stomatitis (VS) disease cases from surveillance, and a suite of environmental factors, our study assessed environmental and phylogenetic similarity to compare VS cases reported in 2014 and 2015. Despite uncertainties from incomplete virus sampling and cross-scale spatial processes, patterns suggested multiple independent re-invasion events concurrent with potential viral overwintering between sequential seasons. Our findings pointed to a geographically defined southern virus pool at the US-Mexico interface as the source of VSNJV invasions and overwintering sites. Phylodynamic analysis demonstrated an increase in virus diversity before a rise in case numbers and a pronounced reduction in virus diversity during the winter season, indicative of a genetic bottleneck and a significant narrowing of virus variation between the summer outbreak seasons. Environment-vector interactions underscored the central role of meta-population dynamics in driving disease spread. These insights emphasize the necessity for location- and time-specific management practices, including rapid response, movement restrictions, vector control, and other targeted interventions.
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Affiliation(s)
- John M. Humphreys
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan Kansas, KS 66502, USA; (L.V.-S.); (M.R.B.); (L.L.R.)
| | - Phillip T. Shults
- Arthropod-Borne Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, KS 66502, USA;
| | - Lauro Velazquez-Salinas
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan Kansas, KS 66502, USA; (L.V.-S.); (M.R.B.); (L.L.R.)
| | - Miranda R. Bertram
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan Kansas, KS 66502, USA; (L.V.-S.); (M.R.B.); (L.L.R.)
| | - Angela M. Pelzel-McCluskey
- Veterinary Services, Animal and Plant Health Inspection Service (APHIS), U.S. Department of Agriculture, Fort Collins, CO 80526, USA;
| | - Steven J. Pauszek
- Foreign Animal Disease Diagnostic Laboratory, National Veterinary Services Laboratories, Animal and Plant Health Inspection Service (APHIS), Plum Island Animal Disease Center (PIADC), U.S. Department of Agriculture, Orient, NY 11957, USA;
| | - Debra P. C. Peters
- Office of National Programs, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705, USA;
| | - Luis L. Rodriguez
- Foreign Animal Disease Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Plum Island Animal Disease Center (PIADC) and National Bio Agro Defense Facility (NBAF), Manhattan Kansas, KS 66502, USA; (L.V.-S.); (M.R.B.); (L.L.R.)
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Min KD, Yoo DS. Ecological drivers for poultry farms predisposed to highly pathogenic avian influenza virus infection during the initial phase of the six outbreaks between 2010-2021: a nationwide study in South Korea. Front Vet Sci 2023; 10:1278852. [PMID: 38130434 PMCID: PMC10733472 DOI: 10.3389/fvets.2023.1278852] [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: 08/17/2023] [Accepted: 11/23/2023] [Indexed: 12/23/2023] Open
Abstract
Background Highly pathogenic avian influenza (HPAI) has caused substantial economic losses worldwide. An understanding of the environmental drivers that contribute to spillover transmission from wild birds to poultry farms is important for predicting areas at risk of introduction and developing risk-based surveillance strategies. We conducted an epidemiological study using data from six HPAI outbreak events in South Korea. Materials and methods An aggregate-level study design was implemented using third-level administrative units in South Korea. Only regions with high natural reservoir suitability were included. The incidence of HPAI at chicken and duck farms during the initial phase (30 and 45 days after the first case) of each outbreak event was used as the outcome variable, assuming that cross-species transmission from wild birds was the dominant exposure leading to infection. Candidate environmental drivers were meteorological factors, including temperature, precipitation, humidity, and altitude, as well as the proportion of protected area, farm density, deforestation level, and predator species richness. Logistic regression models were implemented; conditional autoregression models were used in cases of spatial autocorrelation of residuals. Results Lower temperature, higher farm density, and lower predator species richness were significantly associated with a higher risk of HPAI infection on chicken farms. Lower temperature, higher proportion of protected area, and lower predator species richness were significantly associated with a higher risk of HPAI infection on duck farms. Conclusion The predicted dominant transmission routes on chicken and duck farms were horizontal and spillover, respectively. These results reveal a potential protective effect of predator species richness against HPAI outbreaks. Further studies are required to confirm a causal relationship.
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Affiliation(s)
- Kyung-Duk Min
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Dae-sung Yoo
- College of Veterinary Medicine, Chonnam National University, Gwangju, Republic of Korea
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Holcomb KM, Staples JE, Nett RJ, Beard CB, Petersen LR, Benjamin SG, Green BW, Jones H, Johansson MA. Multi-Model Prediction of West Nile Virus Neuroinvasive Disease With Machine Learning for Identification of Important Regional Climatic Drivers. GEOHEALTH 2023; 7:e2023GH000906. [PMID: 38023388 PMCID: PMC10654557 DOI: 10.1029/2023gh000906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 09/15/2023] [Accepted: 10/21/2023] [Indexed: 12/01/2023]
Abstract
West Nile virus (WNV) is the leading cause of mosquito-borne illness in the continental United States (CONUS). Spatial heterogeneity in historical incidence, environmental factors, and complex ecology make prediction of spatiotemporal variation in WNV transmission challenging. Machine learning provides promising tools for identification of important variables in such situations. To predict annual WNV neuroinvasive disease (WNND) cases in CONUS (2015-2021), we fitted 10 probabilistic models with variation in complexity from naïve to machine learning algorithm and an ensemble. We made predictions in each of nine climate regions on a hexagonal grid and evaluated each model's predictive accuracy. Using the machine learning models (random forest and neural network), we identified the relative importance and variation in ranking of predictors (historical WNND cases, climate anomalies, human demographics, and land use) across regions. We found that historical WNND cases and population density were among the most important factors while anomalies in temperature and precipitation often had relatively low importance. While the relative performance of each model varied across climatic regions, the magnitude of difference between models was small. All models except the naïve model had non-significant differences in performance relative to the baseline model (negative binomial model fit per hexagon). No model, including the ensemble or more complex machine learning models, outperformed models based on historical case counts on the hexagon or region level; these models are good forecasting benchmarks. Further work is needed to assess if predictive capacity can be improved beyond that of these historical baselines.
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Affiliation(s)
- Karen M. Holcomb
- Global Systems LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
- Now at Division of Vector‐Borne DiseasesCenters for Disease Control and PreventionFort CollinsCOUSA
| | - J. Erin Staples
- Division of Vector‐Borne DiseasesCenters for Disease Control and PreventionFort CollinsCOUSA
| | - Randall J. Nett
- Division of Vector‐Borne DiseasesCenters for Disease Control and PreventionFort CollinsCOUSA
| | - Charles B. Beard
- Division of Vector‐Borne DiseasesCenters for Disease Control and PreventionFort CollinsCOUSA
| | - Lyle R. Petersen
- Division of Vector‐Borne DiseasesCenters for Disease Control and PreventionFort CollinsCOUSA
| | - Stanley G. Benjamin
- Global Systems LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
- Cooperative Institute for Research in Environmental SciencesUniversity of Colorado BoulderBoulderCOUSA
| | - Benjamin W. Green
- Global Systems LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
- Cooperative Institute for Research in Environmental SciencesUniversity of Colorado BoulderBoulderCOUSA
| | - Hunter Jones
- Climate Prediction OfficeNational Oceanic and Atmospheric AdministrationSilver SpringMDUSA
| | - Michael A. Johansson
- Division of Vector‐Borne DiseasesCenters for Disease Control and PreventionSan JuanPRUSA
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Schwarz ER, Long MT. Comparison of West Nile Virus Disease in Humans and Horses: Exploiting Similarities for Enhancing Syndromic Surveillance. Viruses 2023; 15:1230. [PMID: 37376530 DOI: 10.3390/v15061230] [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: 04/18/2023] [Revised: 05/22/2023] [Accepted: 05/23/2023] [Indexed: 06/29/2023] Open
Abstract
West Nile virus (WNV) neuroinvasive disease threatens the health and well-being of horses and humans worldwide. Disease in horses and humans is remarkably similar. The occurrence of WNV disease in these mammalian hosts has geographic overlap with shared macroscale and microscale drivers of risk. Importantly, intrahost virus dynamics, the evolution of the antibody response, and clinicopathology are similar. The goal of this review is to provide a comparison of WNV infection in humans and horses and to identify similarities that can be exploited to enhance surveillance methods for the early detection of WNV neuroinvasive disease.
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Affiliation(s)
- Erika R Schwarz
- Montana Veterinary Diagnostic Laboratory, MT Department of Livestock, Bozeman, MT 59718, USA
| | - Maureen T Long
- Department of Comparative, Diagnostic, & Population Medicine, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610, USA
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Abstract
Purpose of Review West Nile virus (WNV) is an arbovirus transmitted by mosquitos of the genus Culex. Manifestations of WNV infection range from asymptomatic to devastating neuroinvasive disease leading to flaccid paralysis and death. This review examines WNV epidemiology and ecology, with an emphasis on travel-associated infection. Recent Findings WNV is widespread, including North America and Europe, where its range has expanded in the past decade. Rising temperatures in temperate regions are predicted to lead to an increased abundance of Culex mosquitoes and an increase in their ability to transmit WNV. Although the epidemiologic patterns of WNV appear variable, its geographic distribution most certainly will continue to increase. Travelers are at risk for WNV infection and its complications. Literature review identified 39 cases of documented travel-related WNV disease, the majority of which resulted in adverse outcomes, such as neuroinvasive disease, prolonged recovery period, or death. Summary The prediction of WNV risk is challenging due to the complex interactions of vector, pathogen, host, and environment. Travelers planning to visit endemic areas should be advised regarding WNV risk and mosquito bite prevention. Evaluation of ill travelers with compatible symptoms should consider the diagnosis of WNV for those visiting in endemic areas as well as for those returning from destinations with known WNV circulation.
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Special Issue “Mosquito-Borne Virus Ecology”. Viruses 2022; 14:v14020357. [PMID: 35215949 PMCID: PMC8875898 DOI: 10.3390/v14020357] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 02/03/2022] [Indexed: 11/17/2022] Open
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Humphreys JM, Pelzel-McCluskey AM, Cohnstaedt LW, McGregor BL, Hanley KA, Hudson AR, Young KI, Peck D, Rodriguez LL, Peters DPC. Integrating Spatiotemporal Epidemiology, Eco-Phylogenetics, and Distributional Ecology to Assess West Nile Disease Risk in Horses. Viruses 2021; 13:v13091811. [PMID: 34578392 PMCID: PMC8473291 DOI: 10.3390/v13091811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 12/13/2022] Open
Abstract
Mosquito-borne West Nile virus (WNV) is the causative agent of West Nile disease in humans, horses, and some bird species. Since the initial introduction of WNV to the United States (US), approximately 30,000 horses have been impacted by West Nile neurologic disease and hundreds of additional horses are infected each year. Research describing the drivers of West Nile disease in horses is greatly needed to better anticipate the spatial and temporal extent of disease risk, improve disease surveillance, and alleviate future economic impacts to the equine industry and private horse owners. To help meet this need, we integrated techniques from spatiotemporal epidemiology, eco-phylogenetics, and distributional ecology to assess West Nile disease risk in horses throughout the contiguous US. Our integrated approach considered horse abundance and virus exposure, vector and host distributions, and a variety of extrinsic climatic, socio-economic, and environmental risk factors. Birds are WNV reservoir hosts, and therefore we quantified avian host community dynamics across the continental US to show intra-annual variability in host phylogenetic structure and demonstrate host phylodiversity as a mechanism for virus amplification in time and virus dilution in space. We identified drought as a potential amplifier of virus transmission and demonstrated the importance of accounting for spatial non-stationarity when quantifying interaction between disease risk and meteorological influences such as temperature and precipitation. Our results delineated the timing and location of several areas at high risk of West Nile disease and can be used to prioritize vaccination programs and optimize virus surveillance and monitoring.
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Affiliation(s)
- John M. Humphreys
- Pest Management Research Unit, Agricultural Research Service, US Department of Agriculture, Sidney, MT 59270, USA
- Correspondence:
| | - Angela M. Pelzel-McCluskey
- Veterinary Services, Animal and Plant Health Inspection Service (APHIS), US Department of Agriculture, Fort Collins, CO 80526, USA;
| | - Lee W. Cohnstaedt
- Arthropod-Borne Animal Disease Research Unit, Agricultural Research Service, US Department of Agriculture, Manhattan, KS 66502, USA; (L.W.C.); (B.L.M.)
| | - Bethany L. McGregor
- Arthropod-Borne Animal Disease Research Unit, Agricultural Research Service, US Department of Agriculture, Manhattan, KS 66502, USA; (L.W.C.); (B.L.M.)
| | - Kathryn A. Hanley
- Department of Biology, New Mexico State University, Las Cruces, NM 88003, USA; (K.A.H.); (K.I.Y.)
| | - Amy R. Hudson
- Big Data Initiative and SCINet Program for Scientific Computing, Agricultural Research Service, US Department of Agriculture, Beltsville, MD 20704, USA; (A.R.H.); (D.P.C.P.)
| | - Katherine I. Young
- Department of Biology, New Mexico State University, Las Cruces, NM 88003, USA; (K.A.H.); (K.I.Y.)
| | - Dannele Peck
- Northern Plains Climate Hub, US Department of Agriculture, Fort Collins, CO 80526, USA;
| | - Luis L. Rodriguez
- Plum Island Animal Disease Center, US Department of Agriculture, Orient Point, NY 11957, USA;
| | - Debra P. C. Peters
- Big Data Initiative and SCINet Program for Scientific Computing, Agricultural Research Service, US Department of Agriculture, Beltsville, MD 20704, USA; (A.R.H.); (D.P.C.P.)
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Humphreys JM, Douglas DC, Ramey AM, Mullinax JM, Soos C, Link P, Walther P, Prosser DJ. The spatial–temporal relationship of blue‐winged teal to domestic poultry: Movement state modelling of a highly mobile avian influenza host. J Appl Ecol 2021. [DOI: 10.1111/1365-2664.13963] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- John M. Humphreys
- Agricultural Research Service U.S. Department of Agriculture Sidney MT USA
- Eastern Ecological Science Center at the Patuxent Research RefugeU.S. Geological Survey Laurel MD USA
| | | | - Andrew M. Ramey
- Alaska Science Center U.S. Geological Survey Anchorage AK USA
| | | | - Catherine Soos
- Ecotoxicology and Wildlife Health Division Environment and Climate Change Canada, Saskatoon Saskatchewan CA USA
| | - Paul Link
- Louisiana Department of Wildlife and Fisheries Baton Rouge LA USA
| | - Patrick Walther
- Texas Chenier Plain Refuge Complex U.S. Fish and Wildlife Service Anahuac TX USA
| | - Diann J. Prosser
- Eastern Ecological Science Center at the Patuxent Research RefugeU.S. Geological Survey Laurel MD USA
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