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Gutiérrez-Jara JP, Muñoz-Quezada MT, Córdova-Lepe F, Silva-Guzmán A. Mathematical Model of the Spread of Hantavirus Infection. Pathogens 2023; 12:1147. [PMID: 37764955 PMCID: PMC10536976 DOI: 10.3390/pathogens12091147] [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: 08/03/2023] [Revised: 08/30/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023] Open
Abstract
A mathematical epidemiological model incorporating the mobility of rodents and human groups among zones of less or major contact between them is presented. The hantavirus infection dynamics is expressed using a model type SEIR (Susceptible-Exposed-Infectious-Removed), which incorporates the displacement of the rodent and the human, between the urban and rural sector, the latter being subdivided in populated and non-populated. The results show the impact that rodent or human displacement may have on the propagation of hantavirus infection. Human mobility is more significant than rodents in increasing the number of hantavirus infection cases. The results found may be used as a reference by the health authorities to develop more specific campaigns on the territorial dynamics of the rodent, attend to the mobility of humans in these territories, mainly agricultural and forestry workers, and strengthen control-prevention actions in the community, to prevent future outbreaks that are fatal.
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Affiliation(s)
- Juan Pablo Gutiérrez-Jara
- Centro de Investigación de Estudios Avanzados del Maule (CIEAM), Vicerrectoría de Investigación y Postgrado, Universidad Católica del Maule, Talca 3480112, Chile
| | - María Teresa Muñoz-Quezada
- School of Public Health, Faculty of Medicine, Universidad de Chile, Avenida Independencia 939, Santiago 8320000, Chile;
| | - Fernando Córdova-Lepe
- Facultad de Ciencias Básicas, Universidad Católica del Maule, Avenida San Miguel 3605, Talca 3480112, Chile;
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Data-driven models for replication kinetics of Orthohantavirus infections. Math Biosci 2022; 349:108834. [DOI: 10.1016/j.mbs.2022.108834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 05/09/2022] [Accepted: 05/10/2022] [Indexed: 12/16/2022]
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Gutiérrez Jaraa JP, Quezada MT. Modeling of hantavirus cardiopulmonary syndrome. Medwave 2022; 22:e8722. [DOI: 10.5867/medwave.2022.03.002526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 03/01/2022] [Indexed: 11/27/2022] Open
Abstract
Introduction Hantavirus cardiopulmonary syndrome is an infection caused by rodents of the Bunyanvirales family towards humans. This disease in Chile is considered endemic, which has a high fatality rate. At present, some studies show the contagion between people of the Andes virus, whose locality is concentrated in Argentina and Chile. Objectives Analyze the possibility of hantavirus transmission between humans using an SEIR-type mathematical model. Methods An SEIR (Susceptible, Exposed, Infectious and Recovered) mathematical model to express the dynamics of hantavirus disease is proposed, including the possibility of human-to-human transmission and the perception of risk. Results The peak of human-to-human contagion decreases by about 25% after increasing people’s perception of risk by reducing the rate of resistance to changeand increasing the speed of people’s reaction. Conclusions It is urgent to review risk communication strategies and prevention measures in the face of this possibility of massive human-tohuman infections, in addition to strengthening research and planning the development of a vaccine to protect populations exposed to this disease with a high fatality rate.
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Spruill-Harrell B, Pérez-Umphrey A, Valdivieso-Torres L, Cao X, Owen RD, Jonsson CB. Impact of Predator Exclusion and Habitat on Seroprevalence of New World Orthohantavirus Harbored by Two Sympatric Rodents within the Interior Atlantic Forest. Viruses 2021; 13:1963. [PMID: 34696393 PMCID: PMC8538774 DOI: 10.3390/v13101963] [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] [Received: 08/20/2021] [Revised: 09/19/2021] [Accepted: 09/24/2021] [Indexed: 11/17/2022] Open
Abstract
Understanding how perturbations to trophic interactions influence virus-host dynamics is essential in the face of ongoing biodiversity loss and the continued emergence of RNA viruses and their associated zoonoses. Herein, we investigated the role of predator exclusion on rodent communities and the seroprevalence of hantaviruses within the Reserva Natural del Bosque Mbaracayú (RNBM), which is a protected area of the Interior Atlantic Forest (IAF). In the IAF, two sympatric rodent reservoirs, Akodon montensis and Oligoryzomys nigripes, harbor Jaborá and Juquitiba hantavirus (JABV, JUQV), respectively. In this study, we employed two complementary methods for predator exclusion: comprehensive fencing and trapping/removal. The goal of exclusion was to preclude the influence of predation on small mammals on the sampling grids and thereby potentially reduce rodent mortality. Following baseline sampling on three grid pairs with different habitats, we closed the grids and began predator removal. By sampling three habitat types, we controlled for habitat-specific effects, which is important for hantavirus-reservoir dynamics in neotropical ecosystems. Our six-month predator exclusion experiment revealed that the exclusion of terrestrial mammalian predators had little influence on the rodent community or the population dynamics of A. montensis and O. nigripes. Instead, fluctuations in species diversity and species abundances were influenced by sampling session and forest degradation. These results suggest that seasonality and landscape composition play dominant roles in the prevalence of hantaviruses in rodent reservoirs in the IAF ecosystem.
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Affiliation(s)
- Briana Spruill-Harrell
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
| | - Anna Pérez-Umphrey
- School of Renewable Natural Resources, Louisiana State University and AgCenter, 227 RNR Building, Baton Rouge, LA 70803, USA;
| | | | - Xueyuan Cao
- Department of Nursing-Acute/Tert Care, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
| | - Robert D. Owen
- Centro para el Desarrollo de la Investigación Científica, Asunción C.P. 1371, Paraguay;
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Colleen B. Jonsson
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
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Norris MH, Kirpich A, Bluhm AP, Zincke D, Hadfield T, Ponciano JM, Blackburn JK. Convergent evolution of diverse Bacillus anthracis outbreak strains toward altered surface oligosaccharides that modulate anthrax pathogenesis. PLoS Biol 2020; 18:e3001052. [PMID: 33370274 PMCID: PMC7793302 DOI: 10.1371/journal.pbio.3001052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 01/08/2021] [Accepted: 12/14/2020] [Indexed: 11/19/2022] Open
Abstract
Bacillus anthracis, a spore-forming gram-positive bacterium, causes anthrax. The external surface of the exosporium is coated with glycosylated proteins. The sugar additions are capped with the unique monosaccharide anthrose. The West African Group (WAG) B. anthracis have mutations rendering them anthrose deficient. Through genome sequencing, we identified 2 different large chromosomal deletions within the anthrose biosynthetic operon of B. anthracis strains from Chile and Poland. In silico analysis identified an anthrose-deficient strain in the anthrax outbreak among European heroin users. Anthrose-deficient strains are no longer restricted to West Africa so the role of anthrose in physiology and pathogenesis was investigated in B. anthracis Sterne. Loss of anthrose delayed spore germination and enhanced sporulation. Spores without anthrose were phagocytized at higher rates than spores with anthrose, indicating that anthrose may serve an antiphagocytic function on the spore surface. The anthrose mutant had half the LD50 and decreased time to death (TTD) of wild type and complement B. anthracis Sterne in the A/J mouse model. Following infection, anthrose mutant bacteria were more abundant in the spleen, indicating enhanced dissemination of Sterne anthrose mutant. At low sample sizes in the A/J mouse model, the mortality of ΔantC-infected mice challenged by intranasal or subcutaneous routes was 20% greater than wild type. Competitive index (CI) studies indicated that spores without anthrose disseminated to organs more extensively than a complemented mutant. Death process modeling using mouse mortality dynamics suggested that larger sample sizes would lead to significantly higher deaths in anthrose-negative infected animals. The model was tested by infecting Galleria mellonella with spores and confirmed the anthrose mutant was significantly more lethal. Vaccination studies in the A/J mouse model showed that the human vaccine protected against high-dose challenges of the nonencapsulated Sterne-based anthrose mutant. This work begins to identify the physiologic and pathogenic consequences of convergent anthrose mutations in B. anthracis.
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Affiliation(s)
- Michael H. Norris
- Spatial Epidemiology & Ecology Research Laboratory, Department of Geography, University of Florida, Gainesville, Florida, United States of America
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America
| | - Alexander Kirpich
- Department of Population Health Services, Georgia State University, Atlanta, Georgia, United States of America
| | - Andrew P. Bluhm
- Spatial Epidemiology & Ecology Research Laboratory, Department of Geography, University of Florida, Gainesville, Florida, United States of America
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America
| | - Diansy Zincke
- Spatial Epidemiology & Ecology Research Laboratory, Department of Geography, University of Florida, Gainesville, Florida, United States of America
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America
| | - Ted Hadfield
- Spatial Epidemiology & Ecology Research Laboratory, Department of Geography, University of Florida, Gainesville, Florida, United States of America
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America
| | - Jose Miguel Ponciano
- Department of Biology, University of Florida, Gainesville, Florida, United States of America
| | - Jason K. Blackburn
- Spatial Epidemiology & Ecology Research Laboratory, Department of Geography, University of Florida, Gainesville, Florida, United States of America
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America
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Reijniers J, Tersago K, Borremans B, Hartemink N, Voutilainen L, Henttonen H, Leirs H. Why Hantavirus Prevalence Does Not Always Increase With Host Density: Modeling the Role of Host Spatial Behavior and Maternal Antibodies. Front Cell Infect Microbiol 2020; 10:536660. [PMID: 33134187 PMCID: PMC7550670 DOI: 10.3389/fcimb.2020.536660] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 08/24/2020] [Indexed: 12/23/2022] Open
Abstract
For wildlife diseases, one often relies on host density to predict host infection prevalence and the subsequent force of infection to humans in the case of zoonoses. Indeed, if transmission is mainly indirect, i.e., by way of the environment, the force of infection is expected to increase with host density, yet the laborious field data supporting this theoretical claim are often absent. Hantaviruses are among those zoonoses that have been studied extensively over the past decades, as they pose a significant threat to humans. In Europe, the most widespread hantavirus is the Puumala virus (PUUV), which is carried by the bank vole and causes nephropathia epidemica (NE) in humans. Extensive field campaigns have been carried out in Central Finland to shed light on this supposed relationship between bank vole density and PUUV prevalence and to identify other drivers for the infection dynamics. This resulted in the surprising observation that the relationship between bank vole density and PUUV prevalence is not purely monotonic on an annual basis, contrary to what previous models predicted: a higher vole density does not necessary result in a higher infection prevalence, nor in an increased number of humans reported having NE. Here, we advance a novel individual-based spatially-explicit model which takes into account the immunity provided by maternal antibodies and which simulates the spatial behavior of the host, both possible causes for this discrepancy that were not accounted for in previous models. We show that the reduced prevalence in peak years can be attributed to transient immunity, and that the density-dependent spatial vole behavior, i.e., the fact that home ranges are smaller in high density years, plays only a minor role. The applicability of the model is not limited to the study and prediction of PUUV (and NE) occurrence in Europe, as it could be easily adapted to model other rodent-borne diseases, either with indirect or direct transmission.
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Affiliation(s)
- Jonas Reijniers
- Evolutionary Ecology Group, Biology Department, University of Antwerp, Antwerp, Belgium.,Active Perception Lab, Department of Engineering Management, University of Antwerp, Antwerp, Belgium
| | - Katrien Tersago
- Agentschap Zorg en Gezondheid, Government Administration, Brussels, Belgium
| | - Benny Borremans
- Evolutionary Ecology Group, Biology Department, University of Antwerp, Antwerp, Belgium.,Department of Ecology and Evolutionary Biology, University of California, Los Angeles, Los Angeles, CA, United States.,Interuniversity Institute for Biostatistics and Statistical Bioinformatics, Hasselt University, Hasselt, Belgium
| | - Nienke Hartemink
- Theoretical Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands.,Biometris, Wageningen University and Research, Wageningen, Netherlands
| | | | - Heikki Henttonen
- Terrestrial Population Dynamics, Natural Resources Institute Finland, Helsinki, Finland
| | - Herwig Leirs
- Evolutionary Ecology Group, Biology Department, University of Antwerp, Antwerp, Belgium
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Abdullahi A, Shohaimi S, Kilicman A, Ibrahim MH. Stochastic models in seed dispersals: random walks and birth-death processes. JOURNAL OF BIOLOGICAL DYNAMICS 2019; 13:345-361. [PMID: 31056007 DOI: 10.1080/17513758.2019.1605003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Accepted: 04/01/2019] [Indexed: 06/09/2023]
Abstract
Seed dispersals deal with complex systems through which the data collected using advanced seed tracking facilities pose challenges to conventional approaches, such as empirical and deterministic models. The use of stochastic models in current seed dispersal studies is encouraged. This review describes three existing stochastic models: the birth-death process (BDP), a 2 dimensional ( 2D ) symmetric random walks and a 2D intermittent walks. The three models possess Markovian property, which make them flexible for studying natural phenomena. Only a few of applications in ecology are found in seed dispersals. The review illustrates how the models are to be used in seed dispersals context. Using the nonlinear BDP, we formulate the individual-based models for two competing plant species while the cover time model is formulated by the symmetric and intermittent random walks. We also show that these three stochastic models can be formulated using the Gillespie algorithm. The full cover time obtained by the symmetric random walks can approximate the Gumbel distribution pattern as the other searching strategies do. We suggest that the applications of these models in seed dispersals may lead to understanding of many complex systems, such as the seed removal experiments and behaviour of foraging agents, among others.
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Affiliation(s)
- A Abdullahi
- a Institute for Mathematical Research , Universiti Putra Malaysia , Serdang , Selangor , Malaysia
- b Department of Mathematics and Computer Science , Federal University Kashere , Kashere , Nigeria
| | - S Shohaimi
- a Institute for Mathematical Research , Universiti Putra Malaysia , Serdang , Selangor , Malaysia
- c Department of Biology , Universiti Putra Malaysia , Serdang , Selangor , Malaysia
| | - A Kilicman
- a Institute for Mathematical Research , Universiti Putra Malaysia , Serdang , Selangor , Malaysia
- d Department of Mathematics , Universiti Putra Malaysia , Serdang , Selangor , Malaysia
| | - M H Ibrahim
- c Department of Biology , Universiti Putra Malaysia , Serdang , Selangor , Malaysia
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Milholland MT, Castro-Arellano I, Garcia-Peña GE, Mills JN. The Ecology and Phylogeny of Hosts Drive the Enzootic Infection Cycles of Hantaviruses. Viruses 2019; 11:v11070671. [PMID: 31340455 PMCID: PMC6669546 DOI: 10.3390/v11070671] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/17/2019] [Accepted: 07/19/2019] [Indexed: 12/13/2022] Open
Abstract
Hantaviruses (Family: Hantaviridae; genus: Orthohantavirus) and their associated human diseases occur globally and differ according to their geographic distribution. The structure of small mammal assemblages and phylogenetic relatedness among host species are suggested as strong drivers for the maintenance and spread of hantavirus infections in small mammals. We developed predictive models for hantavirus infection prevalence in rodent assemblages using defined ecological correlates from our current knowledge of hantavirus-host distributions to provide predictive models at the global and continental scale. We utilized data from published research between 1971–2014 and determined the biological and ecological characteristics of small mammal assemblages to predict the prevalence of hantavirus infections. These models are useful in predicting hantavirus disease outbreaks based on environmental and biological information obtained through the surveillance of rodents.
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Affiliation(s)
- Matthew T Milholland
- College of Agriculture and Natural Resources-Department of Environmental Sciences and Technology, University of Maryland, College Park, MD 1433, USA.
- United States Department of Agriculture-Agriculture Research Service, Invasive Insect Biocontrol and Behavior Laboratory, Beltsville, MD 20705, USA.
| | | | - Gabriel E Garcia-Peña
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City 04510, México
- Centro de Ciencias de la Complejidad C3, Universidad Nacional Autónoma de México, México City 04510, México
- UMR MIVEGEC, Maladies Infectieuses et Vecteurs: Ecologie, Génétique, Evolution et Contrôle, UMR 5290, CNRIS-IRD-Université de Montpellier, Centre de Recherche IRD, Montpellier Cedex 5 34192, France
| | - James N Mills
- Population Biology, Ecology, and Evolution Program, Emory University, Atlanta, GA 30322, USA
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Davies J, Lokuge K, Glass K. Routine and pulse vaccination for Lassa virus could reduce high levels of endemic disease: A mathematical modelling study. Vaccine 2019; 37:3451-3456. [PMID: 31088745 DOI: 10.1016/j.vaccine.2019.05.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 05/03/2019] [Accepted: 05/03/2019] [Indexed: 12/24/2022]
Abstract
Lassa fever is an acute viral illness caused by Lassa virus (LASV), a rodent-borne pathogen. LASV is endemic to much of Sub-Saharan West Africa, where seasonal outbreaks cause significant morbidity and mortality. Increased global awareness of LASV has led to development of improved diagnostic tests, treatments and vaccines. As vaccine candidates are trialled, it is essential to assess the potential outcomes of introducing a LASV vaccination program in endemic regions. This study investigates the potential outcomes of routine and pulse vaccination strategies using a deterministic mathematical model that captures seasonal LASV transmission between rodents and humans. For plausible parameter values, we find that immunization of 40% of infants at 70% vaccine effectiveness achieves a population-level reduction in infectious case numbers of 30%, while coverage of 60% at 90% vaccine effectiveness achieves a 56% reduction. Similar reductions can be achieved more rapidly via population-wide pulse vaccination at 11% coverage (30% reduction at 70% effectiveness) or 23% coverage (56% reduction at 90% effectiveness) repeated every 10 years. Similar pulse vaccine doses delivered at reduced frequency, but increased coverage achieves a greater reduction in infectious cases. Findings around infant vaccination are sensitive to our assumption that immunity is life-long, while pulse-vaccination has only slightly reduced effect if immunity lasts 10-30 years. An effective LASV vaccination program would incorporate pulse vaccination in addition to routine childhood immunization to limit disease. Estimates of feasible vaccine coverage and effectiveness are needed to fully quantify the likely benefits of a vaccination program in LASV endemic regions.
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Affiliation(s)
- Josephine Davies
- Medical School, Australian National University, Canberra, Australia
| | - Kamalini Lokuge
- Research School of Population Health, Australian National University, Canberra, Australia
| | - Kathryn Glass
- Research School of Population Health, Australian National University, Canberra, Australia.
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10
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Parand K, Yousefi H, Fotouhifar M, Delkhosh M, Hosseinzadeh M. Shifted Boubaker Lagrangian approach for solving biological systems. INT J BIOMATH 2018. [DOI: 10.1142/s1793524518500390] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Mathematical models and computer simulations are useful experimental tools for building and testing theories. Many mathematical models in biology can be formulated by a nonlinear system of ordinary differential equations. This work deals with the numerical solution of the hantavirus infection model, the human immunodeficiency virus (HIV) infection model of CD4[Formula: see text]T cells and the susceptible–infected–removed (SIR) epidemic model using a new reliable algorithm based on shifted Boubaker Lagrangian (SBL) method. This method reduces the solution of such system to a system of linear or nonlinear algebraic equations which are solved using the Newton iteration method. The obtained results of the proposed method show highly accurate and valid for an arbitrary finite interval. Also, those are compared with fourth-order Runge–Kutta (RK4) method and with the solutions obtained by some other methods in the literature.
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Affiliation(s)
- Kourosh Parand
- Department of Computer Sciences, Shahid Beheshti University, G.C., Tehran, Iran
- Department of Cognitive Modelling, Institute for Cognitive and Brain Sciences, Shahid Beheshti University, G.C., Tehran, Iran
| | - Hossein Yousefi
- Department of Computer Sciences, Shahid Beheshti University, G.C., Tehran, Iran
| | - Mina Fotouhifar
- Department of Computer Sciences, Shahid Beheshti University, G.C., Tehran, Iran
| | - Mehdi Delkhosh
- Department of Computer Sciences, Shahid Beheshti University, G.C., Tehran, Iran
| | - Mehdi Hosseinzadeh
- Iran University of Medical Sciences, Tehran, Iran
- Computer Science, University of Human Development, Sulaimaniyah, Iraq
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Bürger R, Chowell G, Gavilán E, Mulet P, Villada LM. Numerical solution of a spatio-temporal gender-structured model for hantavirus infection in rodents. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2018; 15:95-123. [PMID: 29161828 DOI: 10.3934/mbe.2018004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this article we describe the transmission dynamics of hantavirus in rodents using a spatio-temporal susceptible-exposed-infective-recovered (SEIR) compartmental model that distinguishes between male and female subpopulations [L.J.S. Allen, R.K. McCormack and C.B. Jonsson, Bull. Math. Biol. 68 (2006), 511--524]. Both subpopulations are assumed to differ in their movement with respect to local variations in the densities of their own and the opposite gender group. Three alternative models for the movement of the male individuals are examined. In some cases the movement is not only directed by the gradient of a density (as in the standard diffusive case), but also by a non-local convolution of density values as proposed, in another context, in [R.M. Colombo and E. Rossi, Commun. Math. Sci., 13 (2015), 369--400]. An efficient numerical method for the resulting convection-diffusion-reaction system of partial differential equations is proposed. This method involves techniques of weighted essentially non-oscillatory (WENO) reconstructions in combination with implicit-explicit Runge-Kutta (IMEX-RK) methods for time stepping. The numerical results demonstrate significant differences in the spatio-temporal behavior predicted by the different models, which suggest future research directions.
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Affiliation(s)
- Raimund Bürger
- CI²MA and Departamento de Ingeniería Matemática , Universidad de Concepción, Casilla 160-C, Concepción , Chile
| | - Gerardo Chowell
- Mathematical, Computational and Modeling Sciences Center, School of Human Evolution and Social Change, Arizona State University, Box 872402, Tempe, AZ 85287, United States
| | - Elvis Gavilán
- CI2MA and Departamento de Ingeniería Matemática , Universidad de Concepción, Casilla 160-C, Concepción, Chile
| | - Pep Mulet
- Departament de Matemàtica Aplicada, Universitat de València, Av. Dr. Moliner 50, E-46100 Burjassot, Spain
| | - Luis M Villada
- GIMNAP-Departamento de Matemáticas, Universidad del Bío-Bío, Casilla 5-C, Concepción, Chile
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Li L, Wang CH, Wang SF, Li MT, Yakob L, Cazelles B, Jin Z, Zhang WY. Hemorrhagic fever with renal syndrome in China: Mechanisms on two distinct annual peaks and control measures. INT J BIOMATH 2018; 11:1850030. [DOI: 10.1142/s1793524518500304] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2023]
Abstract
Hemorrhagic fever with renal syndrome (HFRS) is a rodent-borne disease caused by several serotypes of hantavirus and 90% of all reported HFRS cases occur in China. However, the dynamics of such outbreak, particularly the characteristics of two distinct annual peaks in China, are not well understood. Here, we investigate several of the biologically plausible causes for the peaks in monthly HFRS cases, and find that the key factor is the interplay between periodic transmission rates and rodent periodic birth rate. Analysis of dynamical model reveals that vaccination plays a significant role in the control of HFRS in China. Sensitive analysis of different interventions demonstrates that integrating rodent culling and environmental management with the current vaccination program is effective for HFRS control. Our results suggest that for diseases from animals to human beings, the features of both animals and humans beings should be taken into account in the control and prevention strategies.
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Affiliation(s)
- Li Li
- School of Computer and Information Technology, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
- Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, P. R. China
- Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
| | - Cui-Hua Wang
- Complex Systems Research Center, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
| | - Shi-Fu Wang
- Department of Children’s Medical Laboratory, Diagnosis Center Qilu Children’s Hospital of Shandong University, Jinan 250022, P. R. China
| | - Ming-Tao Li
- Complex Systems Research Center, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
| | - Laith Yakob
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, UK
| | - Bernard Cazelles
- UMMISCO, UMI 209 IRD-UPMC, 93142 Bondy, France
- Eco-Evolutionary Mathematics, IBENS UMR 8197, ENS, Paris, France
| | - Zhen Jin
- Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
- Complex Systems Research Center, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
| | - Wen-Yi Zhang
- Institute of Disease Control and Prevention, Academy of Military Medical Science, Beijing 100071, P. R. China
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Abstract
Hemorrhagic fever with renal syndrome (HFRS) spreading from rodent to human beings is a major public health problem in China, which causes high mortality rate. Data obtained from the China Ministry of Health shows that cases of HFRS in China exhibited monthly periodic outbreak. To well reveal the mechanisms about the outbreak of HFRS, we established a dynamical model to explain the periodic behaviors of HFRS in China. We obtained the basic reproduction number [Formula: see text], analyzed the dynamical behavior of the model, and used the model to fit the monthly data of HFRS cases. Our results demonstrated that periodic transmission rates and rodent periodic birth rate of HFRS in China can give rise to the periodic outbreak of HFRS, hence providing insights into taking measures to control HFRS in China.
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Affiliation(s)
- LI LI
- School of Computer and Information Technology, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
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Fang LQ, Goeijenbier M, Zuo SQ, Wang LP, Liang S, Klein SL, Li XL, Liu K, Liang L, Gong P, Glass GE, van Gorp E, Richardus JH, Ma JQ, Cao WC, de Vlas SJ. The association between hantavirus infection and selenium deficiency in mainland China. Viruses 2015; 7:333-51. [PMID: 25609306 PMCID: PMC4306842 DOI: 10.3390/v7010333] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 01/09/2015] [Accepted: 01/19/2015] [Indexed: 12/17/2022] Open
Abstract
Hemorrhagic fever with renal syndrome (HFRS) caused by hantaviruses and transmitted by rodents is a significant public health problem in China, and occurs more frequently in selenium-deficient regions. To study the role of selenium concentration in HFRS incidence we used a multidisciplinary approach combining ecological analysis with preliminary experimental data. The incidence of HFRS in humans was about six times higher in severe selenium-deficient and double in moderate deficient areas compared to non-deficient areas. This association became statistically stronger after correction for other significant environment-related factors (low elevation, few grasslands, or an abundance of forests) and was independent of geographical scale by separate analyses for different climate regions. A case-control study of HFRS patients admitted to the hospital revealed increased activity and plasma levels of selenium binding proteins while selenium supplementation in vitro decreased viral replication in an endothelial cell model after infection with a low multiplicity of infection (MOI). Viral replication with a higher MOI was not affected by selenium supplementation. Our findings indicate that selenium deficiency may contribute to an increased prevalence of hantavirus infections in both humans and rodents. Future studies are needed to further examine the exact mechanism behind this observation before selenium supplementation in deficient areas could be implemented for HFRS prevention.
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Affiliation(s)
- Li-Qun Fang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; E-Mails: (L.-Q.F.); (S.-Q.Z.); (X.-L.L.); (K.L.)
| | - Marco Goeijenbier
- Department of Viroscience, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3015CE, The Netherlands; E-Mail:
- Authors to whom correspondence should be addressed; E-Mails: (M.G.); (J.-Q.M.); (W.-C.C.); Tel.: +31-10-704-4760 (M.G.); +86-10-58900422 (J.-Q.M.); +86-10-63896082 (W.-C.C.); Fax: +86-10-58900422 (J.-Q.M.); +86-10-63896082 (W.-C.C.)
| | - Shu-Qing Zuo
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; E-Mails: (L.-Q.F.); (S.-Q.Z.); (X.-L.L.); (K.L.)
| | - Li-Ping Wang
- Division of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing 102206, China; E-Mail:
| | - Song Liang
- Environmental and Global Health, College of Public Health and Health Professions, and Emerging Pathogens Institute, University of Florida, Gainesville, FL 32610, USA; E-Mail:
| | - Sabra L. Klein
- Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA; E-Mails: (S.L.K.); (G.E.G.)
| | - Xin-Lou Li
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; E-Mails: (L.-Q.F.); (S.-Q.Z.); (X.-L.L.); (K.L.)
| | - Kun Liu
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; E-Mails: (L.-Q.F.); (S.-Q.Z.); (X.-L.L.); (K.L.)
| | - Lu Liang
- Ministry of Education Key Laboratory for Earth System Modeling, and Center for Earth System Science, Tsinghua University, Beijing 100084, China; E-Mails: (L.L.); (P.G.)
| | - Peng Gong
- Ministry of Education Key Laboratory for Earth System Modeling, and Center for Earth System Science, Tsinghua University, Beijing 100084, China; E-Mails: (L.L.); (P.G.)
| | - Gregory E. Glass
- Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA; E-Mails: (S.L.K.); (G.E.G.)
| | - Eric van Gorp
- Department of Viroscience, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3015CE, The Netherlands; E-Mail:
| | - Jan H. Richardus
- Department of Public Health, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3000CA, The Netherlands; E-Mails: (J.H.R.); (S.J.V.)
| | - Jia-Qi Ma
- National Center for Public Health Surveillance and Information Service, Chinese Center for Disease Control and Prevention, Beijing 102206, China
- Authors to whom correspondence should be addressed; E-Mails: (M.G.); (J.-Q.M.); (W.-C.C.); Tel.: +31-10-704-4760 (M.G.); +86-10-58900422 (J.-Q.M.); +86-10-63896082 (W.-C.C.); Fax: +86-10-58900422 (J.-Q.M.); +86-10-63896082 (W.-C.C.)
| | - Wu-Chun Cao
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China; E-Mails: (L.-Q.F.); (S.-Q.Z.); (X.-L.L.); (K.L.)
- Authors to whom correspondence should be addressed; E-Mails: (M.G.); (J.-Q.M.); (W.-C.C.); Tel.: +31-10-704-4760 (M.G.); +86-10-58900422 (J.-Q.M.); +86-10-63896082 (W.-C.C.); Fax: +86-10-58900422 (J.-Q.M.); +86-10-63896082 (W.-C.C.)
| | - Sake J. de Vlas
- Department of Public Health, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3000CA, The Netherlands; E-Mails: (J.H.R.); (S.J.V.)
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de Thoisy B, Matheus S, Catzeflis F, Clément L, Barrioz S, Guidez A, Donato D, Cornu JF, Brunaux O, Guitet S, Lacoste V, Lavergne A. Maripa hantavirus in French Guiana: phylogenetic position and predicted spatial distribution of rodent hosts. Am J Trop Med Hyg 2014; 90:988-92. [PMID: 24752689 DOI: 10.4269/ajtmh.13-0257] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A molecular screening of wild-caught rodents was conducted in French Guiana, South America to identify hosts of the hantavirus Maripa described in 2008 in a hantavirus pulmonary syndrome (HPS) case. Over a 9-year period, 418 echimyids and murids were captured. Viral RNA was detected in two sigmodontine rodents, Oligoryzomys fulvescens and Zygodontomys brevicauda, trapped close to the house of a second HPS case that occurred in 2009 and an O. fulvescens close to the fourth HPS case identified in 2013. Sequences from the rodents had 96% and 97% nucleotide identity (fragment of S and M segments, respectively) with the sequence of the first human HPS case. Phylogenetic reconstructions based on the complete sequence of the S segment show that Maripa virus is closely related to Rio Mamore hantavirus. Using environmental descriptors of trapping sites, including vegetation, landscape units, rain, and human disturbance, a maximal entropy-based species distribution model allowed for identification of areas of higher predicted occurrence of the two rodents, where emergence risks of Maripa virus are expected to be higher.
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Affiliation(s)
- Benoît de Thoisy
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Séverine Matheus
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - François Catzeflis
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Luc Clément
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Sébastien Barrioz
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Amandine Guidez
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Damien Donato
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Jean-François Cornu
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Olivier Brunaux
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Stéphane Guitet
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Vincent Lacoste
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
| | - Anne Lavergne
- Laboratoire des Interactions Virus-Hôtes, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Virologie, Centre National de Référence des Arbovirus, Virus Influenza et Hantavirus, Laboratoires Associés-Pôle Antilles Guyane, Institut Pasteur de la Guyane, Cayenne, French Guiana; Laboratoire de Paléontologie, Paléobiologie et Phylogénie, Institut des Sciences de l'Evolution, UMR5554, Montpellier, France; Association Kwata, Cayenne, French Guiana; Unité Mixte de Recherche (UMR) Biologie des ORganismes et des Ecosystèmes (BOREA), Département Milieux et Peuplements Aquatiques, Museum National d#x0027;Histoire Naturelle (MNHN), Centre National d#x0027;Etude Scientifique (CNRS) 7208, Institut de Recherche pour le Développement (IRD) 207, Université Pierre et Marie Curie (UPMC), Muséum National d'Histoire Naturelle, Cayenne, French Guiana; Office National des Forêts, Cayenne, French Guiana
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16
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TCHUENCHE JEANM, BAUCH CHRIST. CAN CULLING TO PREVENT MONKEYPOX INFECTION BE COUNTER-PRODUCTIVE? SCENARIOS FROM A THEORETICAL MODEL. J BIOL SYST 2012. [DOI: 10.1142/s0218339012500106] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In the last two decades, monkeypox outbreaks in human populations in Africa and North America have reminded us that smallpox is not the only poxvirus with potential to cause harm in human populations. Monkeypox transmission is sustained in animal reservoirs, and animal–human contacts are responsible for sporadic outbreaks in humans. Here, we develop and analyze a deterministic epizootic (animal-based) transmission model capturing disease dynamics in an animal population, disease dynamics in an age-structured human population, and their coupling through animal–human contacts. We develop a single-patch model as well as a two-patch meta-population extension. We derive mathematical expressions for the basic reproduction number, which governs the likelihood of a large outbreak. We also investigate the effectiveness of culling strategies and the impact of changes in the animal–human contact rate. Numerical analysis of the model suggests that, for some parameter values, culling can actually have the counter-productive outcome of increasing monkeypox infection in children, if animal reproduction is a density-dependent process. The likelihood of this happening, as well as the prevalence of monkeypox in humans, depends sensitively on the animal–human contact rate. We also find that ignoring age structure in human populations can lead to overestimating the transmissibility of monkeypox in humans. The effectiveness of monkeypox control strategies such as culling can strongly depend on the details of demography and epidemiology in the animal reservoirs that sustain it. Therefore, to better understand how to prevent and control monkeypox outbreaks in humans, better empirical data from wild animal populations where monkeypox is endemic must be collected, and these data must be incorporated into highly structured theoretical models.
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Affiliation(s)
- JEAN M. TCHUENCHE
- Department of Mathematics and Statistics, University of Guelph, ON N1G 2W1, Canada
| | - CHRIS T. BAUCH
- Department of Mathematics and Statistics, University of Guelph, ON N1G 2W1, Canada
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ALLEN LJS, BROWN VL, JONSSON CB, KLEIN SL, LAVERTY SM, MAGWEDERE K, OWEN JC, VAN DEN DRIESSCHE P. Mathematical Modeling of Viral Zoonoses in Wildlife. NATURAL RESOURCE MODELING 2012; 25:5-51. [PMID: 22639490 PMCID: PMC3358807 DOI: 10.1111/j.1939-7445.2011.00104.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Zoonoses are a worldwide public health concern, accounting for approximately 75% of human infectious diseases. In addition, zoonoses adversely affect agricultural production and wildlife. We review some mathematical models developed for the study of viral zoonoses in wildlife and identify areas where further modeling efforts are needed.
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Affiliation(s)
- L. J. S. ALLEN
- Department of Mathematics and Statistics, Texas Tech University, Lubbock, TX 79409, E‐mail:
| | - V. L. BROWN
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109
| | - C. B. JONSSON
- Center for Predictive Medicine for Biodefense and Emerging Infectious Disease, University of Louisville, Louisville, KY 40202
| | - S. L. KLEIN
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205
| | - S. M. LAVERTY
- Department of Mathematics, University of Utah, Salt Lake City, UT 84112
| | - K. MAGWEDERE
- Division of Veterinary Public Health, Directorate of Veterinary Services, Mariental, Namibia, Africa
| | - J. C. OWEN
- Departments of Fisheries and Wildlife and Large Animal Clinical Sciences, Michigan State University, East Lansing, MI 48824
| | - P. VAN DEN DRIESSCHE
- Department of Mathematics and Statistics, University of Victoria, Victoria, BC, Canada V8W 3R4
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18
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Orrock JL, Allan BF, Drost CA. Biogeographic and ecological regulation of disease: prevalence of Sin Nombre virus in island mice is related to island area, precipitation, and predator richness. Am Nat 2011; 177:691-7. [PMID: 21508614 DOI: 10.1086/659632] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The relative roles of top-down and bottom-up forces in affecting disease prevalence in wild hosts is important for understanding disease dynamics and human disease risk. We found that the prevalence of Sin Nombre virus (SNV), the agent of a severe disease in humans (hantavirus pulmonary syndrome), in island deer mice from the eight California Channel Islands was greater with increased precipitation (a measure of productivity), greater island area, and fewer species of rodent predators. In finding a strong signal of the ecological forces affecting SNV prevalence, our work highlights the need for future work to understand the relative importance of average rodent density, population fluctuations, behavior, and specialist predators as they affect SNV prevalence. In addition to illustrating the importance of both bottom-up and top-down limitation of disease prevalence, our results suggest that predator richness may have important bearing on the risk of exposure to animal-borne diseases that affect humans.
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Affiliation(s)
- John L Orrock
- Department of Zoology, University of Wisconsin, Madison, 53706, USA.
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Abstract
Hantaviruses are enzootic viruses that maintain persistent infections in their rodent hosts without apparent disease symptoms. The spillover of these viruses to humans can lead to one of two serious illnesses, hantavirus pulmonary syndrome and hemorrhagic fever with renal syndrome. In recent years, there has been an improved understanding of the epidemiology, pathogenesis, and natural history of these viruses following an increase in the number of outbreaks in the Americas. In this review, current concepts regarding the ecology of and disease associated with these serious human pathogens are presented. Priorities for future research suggest an integration of the ecology and evolution of these and other host-virus ecosystems through modeling and hypothesis-driven research with the risk of emergence, host switching/spillover, and disease transmission to humans.
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Owen RD, Goodin DG, Koch DE, Chu YK, Jonsson CB. Spatiotemporal variation in Akodon montensis (Cricetidae: Sigmodontinae) and hantaviral seroprevalence in a subtropical forest ecosystem. J Mammal 2010. [DOI: 10.1644/09-mamm-a-152.1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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21
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Allen LJS, Wesley CL, Owen RD, Goodin DG, Koch D, Jonsson CB, Chu YK, Shawn Hutchinson JM, Paige RL. A habitat-based model for the spread of hantavirus between reservoir and spillover species. J Theor Biol 2009; 260:510-22. [PMID: 19616014 PMCID: PMC2746865 DOI: 10.1016/j.jtbi.2009.07.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2008] [Revised: 06/24/2009] [Accepted: 07/06/2009] [Indexed: 11/30/2022]
Abstract
New habitat-based models for spread of hantavirus are developed which account for interspecies interaction. Existing habitat-based models do not consider interspecies pathogen transmission, a primary route for emergence of new infectious diseases and reservoirs in wildlife and man. The modeling of interspecies transmission has the potential to provide more accurate predictions of disease persistence and emergence dynamics. The new models are motivated by our recent work on hantavirus in rodent communities in Paraguay. Our Paraguayan data illustrate the spatial and temporal overlaps among rodent species, one of which is the reservoir species for Jabora virus and others which are spillover species. Disease transmission occurs when their habitats overlap. Two mathematical models, a system of ordinary differential equations (ODE) and a continuous-time Markov chain (CTMC) model, are developed for spread of hantavirus between a reservoir and a spillover species. Analysis of a special case of the ODE model provides an explicit expression for the basic reproduction number, R(0), such that if R(0)<1, then the pathogen does not persist in either population but if R(0)>1, pathogen outbreaks or persistence may occur. Numerical simulations of the CTMC model display sporadic disease incidence, a new behavior of our habitat-based model, not present in other models, but which is a prominent feature of the seroprevalence data from Paraguay. Environmental changes that result in greater habitat overlap result in more encounters among various species that may lead to pathogen outbreaks and pathogen establishment in a new host.
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Affiliation(s)
- Linda J S Allen
- Texas Tech University, Department of Mathematics and Statistics, Lubbock, TX 79409, USA.
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22
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Gedeon T, Bodelón C, Kuenzi A. Hantavirus transmission in sylvan and peridomestic environments. Bull Math Biol 2009; 72:541-64. [PMID: 19821001 DOI: 10.1007/s11538-009-9460-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2008] [Accepted: 09/14/2009] [Indexed: 10/20/2022]
Abstract
We developed a compartmental model for hantavirus infection in deer mice (Peromyscus maniculatus) with the goal of comparing relative importance of direct and indirect transmission in sylvan and peridomestic environments. A direct transmission occurs when the infection is mediated by the contact of an infected and an uninfected mouse, while an indirect transmission occurs when the infection is mediated by the contact of an uninfected mouse with, for instance, infected soil. Based on population dynamics data and estimates of hantavirus decay in the two types of environments, our model predicts that direct transmission dominates in the sylvan environment, while both pathways are important in peridomestic environments. The model allows us to compute a basic reproduction number R(0), which indicates whether the virus will be endemic or eradicated from the mouse population, in both an autonomous and a time-periodic model. Our analysis can be used to evaluate various eradication strategies.
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Affiliation(s)
- Tomás Gedeon
- Department of Mathematical Sciences, Montana State University, Bozeman, MT 59715, USA.
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23
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Wesley CL, Allen LJS. The basic reproduction number in epidemic models with periodic demographics. JOURNAL OF BIOLOGICAL DYNAMICS 2009; 3:116-29. [PMID: 22880824 DOI: 10.1080/17513750802304893] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Patterns of contact in social behaviour and seasonality due to environmental influences often affect the spread and persistence of diseases. Models of epidemics with seasonality and patterns in the contact rate include time-periodic coefficients, making the systems nonautonomous. No general method exists for calculating the basic reproduction number, the threshold for disease extinction, in nonautonomous epidemic models. However, for some epidemic models with periodic coefficients and constant population size, the time-averaged basic reproduction number has been shown to be a threshold for disease extinction. We extend these results by showing that the time-averaged basic reproduction number is a threshold for disease extinction when the population demographics are periodic. The results are shown to hold in epidemic models with periodic demographics that include temporary immunity, isolation, and multiple strains.
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Affiliation(s)
- Curtis L Wesley
- Department of Mathematics and Statistics, Texas Tech University, Lubbock, TX, USA
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24
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Adler FR, Clay CA, Lehmer EM. The role of heterogeneity in the persistence and prevalence of Sin Nombre virus in deer mice. Am Nat 2009; 172:855-67. [PMID: 18959490 DOI: 10.1086/592405] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Many diseases persist at a relatively low prevalence, seemingly close to extinction. For a chronic disease in a homogeneous population, reducing the transmission rate by a fraction proportional to the prevalence would be sufficient to eradicate the disease. This study examines how higher prevalence of the Sin Nombre virus in male deer mice (Peromyscus maniculatus) might contribute to disease persistence. Analyzing data from over 2,000 individual mice captured in 19 sites over 4 years, we found prevalences of 18.5% in males and 8.8% in females. By examining recaptures, we determined that males are more likely to contract the infection because of higher susceptibility or higher encounter rates. Comparing across 86 sampling periods, we found a higher proportion of males when population densities were low. A capture-recapture analysis indicates that males live longer than females. A mathematical model based on the measured parameters and population size trajectories suggests that the combined heterogeneity in encounters, susceptibility, and mortality may buffer the disease from extinction by concentrating disease in the subgroup most likely to transmit the disease. This buffering effect is not significantly stronger in a fluctuating population, indicating that these forms of heterogeneity might not be the key for disease persistence through host population bottlenecks.
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Affiliation(s)
- F R Adler
- Department of Biology and Department of Mathematics, University of Utah, Salt Lake City, Utah 84112, USA.
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25
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Banerjee C, Allen LJS, Salazar-Bravo J. Models for an arenavirus infection in a rodent population: consequences of horizontal, vertical and sexual transmission. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2008; 5:617-45. [PMID: 19278272 PMCID: PMC9698265 DOI: 10.3934/mbe.2008.5.617] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Arenaviruses are associated with rodent-transmitted diseases in humans. Five arenaviruses are known to cause human illness: Lassa virus, Junin virus, Machupo virus, Guanarito virus and Sabia virus. In this investigation, we model the spread of Machupo virus in its rodent host Calomys callosus. Machupo virus infection in humans is known as Bolivian hemorrhagic fever (BHF) which has a mortality rate of approximately 5-30% [31]. Machupo virus is transmitted among rodents through horizontal (direct contact), vertical (infected mother to offspring) and sexual transmission. The immune response differs among rodents infected with Machupo virus. Either rodents develop immunity and recover (immunocompetent) or they do not develop immunity and remain infected (immunotolerant). We formulate a general deterministic model for male and female rodents consisting of eight differential equations, four for females and four for males. The four states represent susceptible, immunocompetent, immunotolerant and recovered rodents, denoted as S, I( t), I( c)and R, respectively. A unique disease-free equilibrium (DFE) is shown to exist and a basic reproduction number R( 0)is computed using the next generation matrix approach. The DFE is shown to be locally asymptotically stable if R(0) < 1and unstable if R( 0) > 1. Special cases of the general model are studied, where there is only one immune stage, either I(t) or I(c). In the first model, SI(c)R( c), it is assumed that all infected rodents are immunocompetent and recover. In the second model, SI(t), it is assumed that all infected rodents are immunotolerant. For each of these models, the basic reproduction numbers are computed and their relationship to the basic reproduction number of the general model determined. For the SI( t)model, it is shown that bistability may occur, the DFE and an enzootic equilibrium, with all rodents infectious, are locally asymptotically stable for the same set of parameter values. A simplification of the SI( t)model yields a third model, where the sexes are not differentiated, and therefore, there is no sexual transmission. For this third simplified model, the dynamics are completely analyzed. It is shown that there exists a DFE and possibly two additional equilibria, one of which is globally asymptotically stable for any given set of parameter values; bistability does not occur. Numerical examples illustrate the dynamics of the models. The biological implications of the results and future research goals are discussed in the conclusion.
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Affiliation(s)
- Chandrani Banerjee
- Department of Mathematics and Statistics, Texas Tech University, Lubbock, TX 79409-1042, USA
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26
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Hannah MF, Bajic VB, Klein SL. Sex differences in the recognition of and innate antiviral responses to Seoul virus in Norway rats. Brain Behav Immun 2008; 22:503-16. [PMID: 18053684 PMCID: PMC2396444 DOI: 10.1016/j.bbi.2007.10.005] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Revised: 09/24/2007] [Accepted: 10/05/2007] [Indexed: 01/05/2023] Open
Abstract
Among rodents that carry hantaviruses, more males are infected than females. Male rats also have elevated copies of Seoul virus RNA and reduced transcription of immune-related genes in the lungs than females. To further characterize sex differences in antiviral defenses and whether these differences are mediated by gonadal hormones, we examined viral RNA in the lungs, virus shedding in saliva, and antiviral defenses among male and female rats that were intact, gonadectomized neonatally, or gonadectomized in adulthood. Following inoculation with Seoul virus, high amounts viral RNA persisted longer in lungs from intact males than intact females. Removal of the gonads in males reduced the amount of viral RNA to levels comparable with intact females at 40 days post-inoculation (p.i.). Intact males shed more virus in saliva than intact females 15 days p.i.; removal of the gonads during either the neonatal period or in adulthood increased virus shedding in females and decreased virus shedding in males. Induction of pattern recognition receptors (PRRs; Tlr7 and Rig-I), expression of antiviral genes (Myd88, Visa, Jun, Irf7, Ifnbeta, Ifnar1, Jak2, Stat3, and Mx2), and production of Mx protein was elevated in the lungs of intact females compared with intact males. Gonadectomy had more robust effects on the induction of PRRs than on downstream IFNbeta or Mx2 expression. Putative androgen and estrogen response elements are present in the promoters of several of these antiviral genes, suggesting the propensity for sex steroids to directly affect dimorphic antiviral responses against Seoul virus infection.
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Affiliation(s)
- Michele F. Hannah
- The W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205
| | - Vladimir B. Bajic
- South African National Bioinformatics Institute, University of the Western Cape, Bellville 7535, South Africa
| | - Sabra L. Klein
- The W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205,*Address correspondence to: Sabra L. Klein, Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, 615 North Wolfe Street, Baltimore, MD 21205-2179, Phone: (410) 955-8898, Fax: (410) 955-0105,
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27
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Adler FR, Pearce-Duvet JMC, Dearing MD. How host population dynamics translate into time-lagged prevalence: an investigation of Sin Nombre virus in deer mice. Bull Math Biol 2007; 70:236-52. [PMID: 17701378 DOI: 10.1007/s11538-007-9251-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2007] [Accepted: 06/22/2007] [Indexed: 11/24/2022]
Abstract
Human cases of hantavirus pulmonary syndrome caused by Sin Nombre virus are the endpoint of complex ecological cascade from weather conditions, population dynamics of deer mice, to prevalence of SNV in deer mice. Using population trajectories from the literature and mathematical modeling, we analyze the time lag between deer mouse population peaks and peaks in SNV antibody prevalence in deer mice. Because the virus is not transmitted vertically, rapid population growth can lead initially to reduced prevalence, but the resulting higher population size may later increase contact rates and generate increased prevalence. Incorporating these factors, the predicted time lag ranges from 0 to 18 months, and takes on larger values when host population size varies with a longer period or higher amplitude, when mean prevalence is low and when transmission is frequency-dependent. Population size variation due to variation in birth rates rather than death rates also increases the lag. Predicting future human outbreaks of hantavirus pulmonary syndrome may require taking these effects into account.
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Affiliation(s)
- Frederick R Adler
- Department of Mathematics and Department of Biology, 155 South 1400 East, University of Utah, Salt Lake City, UT 84112, USA.
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28
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McCormack RK, Allen LJS. Multi-patch deterministic and stochastic models for wildlife diseases. JOURNAL OF BIOLOGICAL DYNAMICS 2007; 1:63-85. [PMID: 22880613 DOI: 10.1080/17513750601032711] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Spatial heterogeneity and host demography have a direct impact on the persistence or extinction of a disease. Natural or human-made landscape features such as forests, rivers, roads, and crops are important to the persistence of wildlife diseases. Rabies, hantaviruses, and plague are just a few examples of wildlife diseases where spatial patterns of infection have been observed. We formulate multi-patch deterministic and stochastic epidemic models and use these models to investigate problems related to disease persistence and extinction. We show in some special cases that a unique disease-free equilibrium exists. In these cases, a basic reproduction number ℝ(0) can be computed and shown to be bounded below and above by the minimum and maximum patch reproduction numbers ℝ(j), j=1, …, n. The basic reproduction number has a simple form when there is no movement or when all patches are identical or when the movement rate approaches infinity. Numerical examples of the deterministic and stochastic models illustrate the disease dynamics for different movement rates between three patches.
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Affiliation(s)
- Robert K McCormack
- Department of Mathematics and Statistics, Texas Tech University, Lubbock, TX 79409-1042, USA
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