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Gorosito IL, Douglass RJ. A damped precipitation-driven, bottom-up model for deer mouse population abundance in the northwestern United States. Ecol Evol 2017; 7:11113-11123. [PMID: 29299286 PMCID: PMC5743491 DOI: 10.1002/ece3.3598] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 08/11/2017] [Accepted: 10/11/2017] [Indexed: 11/09/2022] Open
Abstract
Small-mammal population densities can be regulated by bottom-up (food availability) and top-down (predation) forces. In 1993, an El Niño Southern Oscillation event was followed by a cluster of human hantavirus with pulmonary syndrome in the southwestern United States. An upward trophic cascade hypothesis was proposed as an explanation for the outbreak: Increased plant productivity as a consequence of El Niño precipitations led to an unusual increase in distribution and abundance of deer mice (Peromyscus maniculatus; reservoir host of Sin Nombre virus). Could such drastic events occur in mesic habitats, where plant productivity in response to climate conditions is likely to be much less dramatic? In this work, we investigate to what extent deer mouse populations follow a precipitation-driven, bottom-up model in central and western Montana and discuss important conditions for such a model to be possible. We found positive correlations between deer mouse abundance and on-the-ground measured plant productivity with a several-month lag in three of six study sites. This effect was weaker when deer mouse populations were more abundant, indicating density-dependent effects. Dispersal resulting from territoriality may be important in attenuating local density increments in spite of high food availability. In addition, there is evidence that population abundance in the study area could respond to other abiotic factors. In particular, precipitation in the form of snow may reduce deer mice survival, thus compensating the benefits of improved plant productivity. Deer mouse populations in Montana study sites follow complex dynamics determined by multiple limiting factors, leading to a damped precipitation-driven bottom-up regulation. This prevents dramatic changes in rodent abundances after sudden increments of food availability, such as those observed in other regions.
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Affiliation(s)
- Irene L. Gorosito
- Departamento de EcologíaGenética y EvoluciónFacultad de Ciencias Exactas y NaturalesUniversidad de Buenos AiresBuenos AiresArgentina
- Instituto de EcologíaGenética y Evolución de Buenos AiresConsejo Nacional de Investigaciones Científicas y TécnicasBuenos AiresArgentina
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Gorosito IL, Marziali Bermúdez M, Douglass RJ, Busch M. Evaluation of statistical methods and sampling designs for the assessment of microhabitat selection based on point data. Methods Ecol Evol 2016. [DOI: 10.1111/2041-210x.12605] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Irene L. Gorosito
- Departamento de Ecología, Genética y Evolución Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Buenos Aires Argentina
- Instituto de Ecología, Genética y Evolución de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas Intendente Güiraldes 2160 ‐ Ciudad Universitaria C1428EGA Buenos Aires Argentina
| | - Mariano Marziali Bermúdez
- Departamento de Física Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Buenos Aires Argentina
- Instituto de Física de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas Intendente Güiraldes 2160 ‐ Ciudad Universitaria C1428EGA Buenos Aires Argentina
| | | | - María Busch
- Departamento de Ecología, Genética y Evolución Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Buenos Aires Argentina
- Instituto de Ecología, Genética y Evolución de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas Intendente Güiraldes 2160 ‐ Ciudad Universitaria C1428EGA Buenos Aires Argentina
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Abstract
We use data collected on 18,1-ha live trapping grids monitored from 1994 through 2005 and on five of those grids through 2013 in the mesic northwestern US to illustrate the complexity of the deer mouse (Peromyscus maniculatus)/Sin Nombre virus (SNV) host-pathogen system. Important factors necessary to understand zoonotic disease ecology include those associated with distribution and population dynamics of reservoir species as well as infection dynamics. Results are based on more than 851,000 trap nights, 16,608 individual deer mice and 10,572 collected blood samples. Deer mice were distributed throughout every habitat we sampled and were present during every sampling period in all habitats except high altitude habitats over1900 m. Abundance varied greatly among locations with peak numbers occurring mostly during fall. However, peak rodent abundance occurred during fall, winter and spring during various years on three grids trapped 12 mo/yr. Prevalence of antibodies to SNV averaged 3.9% to 22.1% but no grids had mice with antibodies during every month. The maximum period without antibody-positive mice ranged from one month to 52 months, or even more at high altitude grids where deer mice were not always present. Months without antibody-positive mice were more prevalent during fall than spring. Population fluctuations were not synchronous over broad geographic areas and antibody prevalences were not well spatially consistent, differing greatly over short distances. We observed an apparently negative, but non-statistically significant relationship between average antibody prevalence and average deer mouse population abundance and a statistically significant positive relationship between the average number of antibody positive mice and average population abundance. We present data from which potential researchers can estimate the effort required to adequately describe the ecology of a rodent-borne viral system. We address different factors affecting population dynamics and hantavirus antibody prevalence and discuss the path to understanding a complex rodent-borne disease system as well as the obstacles in that path.
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Affiliation(s)
| | - María Victoria Vadell
- Laboratorio de Ecología de Poblaciones, Instituto de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA Argentina
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Springer YP, Hoekman D, Johnson PTJ, Duffy PA, Hufft RA, Barnett DT, Allan BF, Amman BR, Barker CM, Barrera R, Beard CB, Beati L, Begon M, Blackmore MS, Bradshaw WE, Brisson D, Calisher CH, Childs JE, Diuk‐Wasser M, Douglass RJ, Eisen RJ, Foley DH, Foley JE, Gaff HD, Gardner SL, Ginsberg HS, Glass GE, Hamer SA, Hayden MH, Hjelle B, Holzapfel CM, Juliano SA, Kramer LD, Kuenzi AJ, LaDeau SL, Livdahl TP, Mills JN, Moore CG, Morand S, Nasci RS, Ogden NH, Ostfeld RS, Parmenter RR, Piesman J, Reisen WK, Savage HM, Sonenshine DE, Swei A, Yabsley MJ. Tick‐, mosquito‐, and rodent‐borne parasite sampling designs for the National Ecological Observatory Network. Ecosphere 2016. [DOI: 10.1002/ecs2.1271] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Carver S, Mills JN, Parmenter CA, Parmenter RR, Richardson KS, Harris RL, Douglass RJ, Kuenzi AJ, Luis AD. Toward a Mechanistic Understanding of Environmentally Forced Zoonotic Disease Emergence: Sin Nombre Hantavirus. Bioscience 2015; 65:651-666. [PMID: 26955081 PMCID: PMC4776718 DOI: 10.1093/biosci/biv047] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Understanding the environmental drivers of zoonotic reservoir and human interactions is crucial to understanding disease risk, but these drivers are poorly predicted. We propose a mechanistic understanding of human-reservoir interactions, using hantavirus pulmonary syndrome as a case study. Crucial processes underpinning the disease's incidence remain poorly studied, including the connectivity among natural and peridomestic deer mouse host activity, virus transmission, and human exposure. We found that disease cases were greatest in arid states and declined exponentially with increasing precipitation. Within arid environments, relatively rare climatic conditions (e.g., El Niño) are associated with increased rainfall and reservoir abundance, producing more frequent virus transmission and host dispersal. We suggest that deer mice increase their occupancy of peridomestic structures during spring-summer, amplifying intraspecific transmission and human infection risk. Disease incidence in arid states may increase with predicted climatic changes. Mechanistic approaches incorporating reservoir behavior, reservoir-human interactions, and pathogen spillover could enhance our understanding of global hantavirus ecology, with applications to other directly transmitted zoonoses.
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Affiliation(s)
- Scott Carver
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - James N Mills
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - Cheryl A Parmenter
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - Robert R Parmenter
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - Kyle S Richardson
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - Rachel L Harris
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - Richard J Douglass
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - Amy J Kuenzi
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
| | - Angela D Luis
- Scott Carver ( ) and Rachel L. Harris are affiliated with the School of Biological Sciences at the University of Tasmania, in Hobart, Tasmania, Australia. James N. Mills is affiliated with the Special Pathogens Branch of the Division of Viral and Rickettsial Diseases at the Centers for Disease Control and Prevention and the Population Biology, Ecology, and Evolution Group at Emory University, in Atlanta, Georgia. Cheryl A. Parmenter is affiliated with the Museum of Southwestern Biology in the Department of Biology at the University of New Mexico, in Albuquerque. Robert R. Parmenter is affiliated with the Department of the Interior (National Park Service), in Jemez Springs, New Mexico. Kyle Richardson is affiliated with the Hopkirk Research Institute, at Massey University, in Palmerston North, New Zealand. SC, KR, Richard J. Douglass, and Amy J. Kuenzi are affiliated with the Department of Biology at Montana Tech of the University of Montana, in Butte. Angela D. Luis is affiliated with the College of Forestry and Conservation at the University of Montana, in Missoula
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Abstract
The most common mechanism for human exposure to hantaviruses throughout North America is inhalation of virally contaminated particulates. However, risk factors associated with exposure to particulates potentially contaminated with hantaviruses are generally not well understood. In North America, Sin Nombre virus (SNV) is the most common hantavirus that infects humans, causing hantavirus pulmonary syndrome, which has a significant mortality rate (approximately 35%). We investigated human exposure to particulate matter and evaluated the effects of season, location (sylvan and peridomestic environment), and activity (walking and sweeping) on generation of particulates at the breathing zone (1.5 m above the ground). We found greater volumes of small inhalable particulates during the spring and summer compared to the fall and winter seasons and greater volumes of small inhalable particulates produced in peridomestic, compared to sylvan, environments. Also, greater volumes of particulates were generated at the breathing zone while walking compared to sweeping. Results suggest that more aerosolized particles were generated during the spring and summer months. Our findings suggest that simply moving around in buildings is a significant source of human exposure to particulates, potentially contaminated with SNV, during spring and summer seasons. These findings could be advanced by investigation of what particle sizes SNV is most likely to attach to, and where in the respiratory tract humans become infected.
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Piudo L, Monteverde MJ, Walker RS, Douglass RJ. [Oligoryzomys longicaudatus characteristics' associated with the presence of Andes virus (Hantavirus)]. Rev Chilena Infectol 2013; 29:200-6. [PMID: 22689036 DOI: 10.4067/s0716-10182012000200013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Accepted: 02/27/2012] [Indexed: 11/17/2022] Open
Abstract
Oligoryzomys longicaudatus is the main reservoir of Andes virus (AND), which causes hantavirus pulmonary syndrome in Patagonia. The factors associated with the presence of antibodies against AND in this species are unknown. This study used a logistic regression model to analyze which characteristics of O. longicaudatus, captured in northern Argentinean Patagonia, led to an increased probability of an animal having antibodies against AND and to relate these characteristics to possible mechanisms of transmission of the virus within the population. Sex, age, body mass, and wounds were important predictors regarding the presence of antibodies against AND within O. longicaudatus populations. The probability of a wounded male O. longicaudatus adult having AND antibodies increased in parallel with the body mass. The probability of having antibodies was more than 80% in individuals with body masses above 44 gram. However, the possible transmission mechanism of AND within O. longicaudatus population is still uncertain and further studies involving a larger number of individuals and prolonged monitoring including the process of seroconversion are needed.
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Affiliation(s)
- Luciana Piudo
- Depto. Fauna Terrestre, Centro de Ecología Aplicada del Neuquén.
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Leary AJ, Kuenzi AJ, Douglass RJ. Grazing Effects on Deer Mice with Implications to Human Exposure to Sin Nombre Virus. Intermt J Sci 2011; 17:30-37. [PMID: 24910509 PMCID: PMC4045612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We examined the effects of grazing on deer mouse (Peromyscus maniculatus) movements into buildings using passive integrated transponder (PIT) technology and small simulated buildings located on 0.6-ha treatment (grazing) and control (no grazing) plots. Twelve experimental 9-day trials were conducted over the course of the study. During these trials, mouse movements into buildings were monitored during three time periods (each 3 days in length). In the treatment plots these time periods corresponded to pre-grazing, grazing, and post grazing by horses. The number of individual deer mice entering buildings over time decreased in both the grazed and control plots during the 9 days of each experiment. The number of entrances per/individual among the pre-grazing, grazing and post grazing periods was different between control and treated plots for both males and females. The distribution of entrances/individual among the three periods differed between males and females in both grazed and control plots. The habitat modification caused by grazing appeared to reduce deer mouse activity (entrances/individual) in buildings but does not affect the number of mice entering buildings. Reducing vegetative cover by grazing or mowing may not affect the number of mice investigating small structures but grazing creates different activity patterns in the structures for neighboring deer mice.
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Affiliation(s)
- Abigail J Leary
- University of Montana, Interdisciplinary Studies Graduate Program, Missoula, MT 59812; Department of Biology, Montana Tech of the University of Montana, Butte, Montana 59701
| | - Amy J Kuenzi
- Department of Biology, Montana Tech of the University of Montana, Butte, Montana 59701
| | - Richard J Douglass
- Department of Biology, Montana Tech of the University of Montana, Butte, Montana 59701
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Piudo L, Monteverde MJ, Walker RS, Douglass RJ. Rodent community structure and Andes virus infection in sylvan and peridomestic habitats in northwestern Patagonia, Argentina. Vector Borne Zoonotic Dis 2011; 11:315-24. [PMID: 21332352 DOI: 10.1089/vbz.2009.0242] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Modifications of natural habitat in peridomestic rural areas could affect original rodent community composition, diversity, and evenness. In zoonoses such as hantavirus pulmonary syndrome, the presence of a diverse community can dilute the impact of the principal reservoir, reducing risk to humans. The goal of this study was to examine rodent community composition, abundance of Andes virus (ANDV) host (Oligoryzomys longicaudatus), ANDV prevalence, and temporal variability associated with rural peridomestic settings in Patagonia, Argentina. We trapped rodents in peridomestic settings and nearby sylvan areas for 2 years. The numerically dominant species differed between peridomestic and sylvan settings. O. longicaudatus was the most abundant species in peridomestic settings (>50% of individuals). Diversity and evenness in peridomestic settings fluctuated temporally, with an abrupt decline in evenness coinciding with peaks in ANDV prevalence. The probability of finding an ANDV-positive mouse in peridomestic settings was 2.44 times greater than in sylvan habitats. Changes in rodent communities in peridomestic settings may increase the probability for human exposure to ANDV because those settings promote the presence of O. longicaudatus with high ANDV antibody prevalence. High O. longicaudatus relative abundance in an unstable community associated with peridomestic settings may favor intraspecific contact, leading to a higher probability of virus transmission.
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Affiliation(s)
- Luciana Piudo
- Departamento Fauna Terrestre, Centro de Ecología Aplicada del Neuquén (CEAN), Junín de los Andes, Neuquén, Argentina.
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Cline BJ, Carver S, Douglass RJ. Relationship of human behavior within outbuildings to potential exposure to Sin Nombre virus in western Montana. Ecohealth 2010; 7:389-393. [PMID: 20508970 DOI: 10.1007/s10393-010-0318-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Accepted: 05/10/2010] [Indexed: 05/29/2023]
Abstract
Sin Nombre virus (SNV) causes hantavirus cardiopulmonary syndrome (HCPS) in humans. Transmission of SNV among the deer mouse (Peromyscus maniculatus) host predominates during spring and summer, and is greater in peridomestic than sylvan settings where, protected from UV light, SNV may survive longer. Incidence of HCPS reflects these times and settings and is associated with inhalation of mouse excreta. Little is known, however, about how human use of outbuildings contributes to potential exposure to SNV. Here, the frequency and seasonality of outbuilding use by humans was evaluated, via a survey of rural residents in western Montana, to quantify human behaviors and potential risk of exposure to SNV. Retrieving or return of tools and scooping feed/grain were the most frequently undertaken activities. Seasonal activities coinciding with seasons of highest HCPS incidence and times of potentially high viral shedding by deer mice, included retrieving or returning tools, calving or lambing, and, to a lesser extent, feeding livestock and sweeping or cleaning. Human behavior is a component of SNV transmission risk and this preliminary study provides a basis from which to further evaluate this route of exposure.
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Affiliation(s)
- Barbara J Cline
- Department of Health and Industrial Hygiene, Montana Tech of the University of Montana, Butte, MT 59701, USA
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Luis AD, Douglass RJ, Mills JN, Bjørnstad ON. The effect of seasonality, density and climate on the population dynamics of Montana deer mice, important reservoir hosts for Sin Nombre hantavirus. J Anim Ecol 2009; 79:462-70. [PMID: 20015212 DOI: 10.1111/j.1365-2656.2009.01646.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
1. Since Sin Nombre virus was discovered in the U.S. in 1993, longitudinal studies of the rodent reservoir host, the deer mouse (Peromyscus maniculatus) have demonstrated a qualitative correlation among mouse population dynamics and risk of hantavirus pulmonary syndrome (HPS) in humans, indicating the importance of understanding deer mouse population dynamics for evaluating risk of HPS. 2. Using capture-mark-recapture statistical methods on a 15-year data set from Montana, we estimated deer mouse survival, maturation and recruitment rates and tested the relative importance of seasonality, population density and local climate in explaining temporal variation in deer mouse demography. 3. From these estimates, we designed a population model to simulate deer mouse population dynamics given climatic variables and compared the model to observed patterns. 4. Month, precipitation 5 months previously, temperature 5 months previously and to a lesser extent precipitation and temperature in the current month, were important in determining deer mouse survival. Month, the sum of precipitation over the last 4 months, and the sum of the temperature over the last 4 months were important in determining recruitment rates. Survival was more important in determining the growth rate of the population than recruitment. 5. While climatic drivers appear to have a complex influence on dynamics, our forecasts were good. Our quantitative model may allow public health officials to better predict increased human risk from basic climatic data.
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Affiliation(s)
- Angela D Luis
- Department of Biology, The Pennsylvania State University, University Park, PA 16801, USA.
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Calisher CH, Peters CJ, Douglass RJ, Kuenzi AJ. Hantaviral infections of rodents: possible scenarios. Arch Virol 2009; 154:1195-7. [PMID: 19568690 DOI: 10.1007/s00705-009-0434-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Accepted: 06/12/2009] [Indexed: 11/29/2022]
Affiliation(s)
- Charles H Calisher
- Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA.
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Lonner BN, Douglass RJ, Kuenzi AJ, Hughes K. Seroprevalence against Sin Nombre virus in resident and dispersing deer mice. Vector Borne Zoonotic Dis 2008; 8:433-41. [PMID: 18447620 DOI: 10.1089/vbz.2007.0232] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Through dispersal, deer mice (Peromyscus maniculatus) enter peridomestic settings (e.g., outbuildings, barns, cabins) and expose humans and other deer mouse populations to Sin Nombre virus (SNV). In June 2004, research on deer mouse dispersal was initiated at 2 locations in Montana. During the course of the study, over 6000 deer mouse movements were recorded, and more than 1000 of these movements were classified as dispersal movements. More than 1700 individual deer mice were captured and tested for SNV, revealing an average SNV antibody prevalence of approximately 11%. Most of the dispersing and antibody-positive individuals were adult males. Among the few subadult dispersing mice discovered during the study, none were seropositive for SNV. Our results suggest that dispersal rates are higher in high abundance populations of deer mice and that during peak times of dispersal, human exposure to SNV, which commonly occurs in peridomestic settings, could increase.
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Affiliation(s)
- Brent N Lonner
- Interdisciplinary Studies Graduate Program, University of Montana, Missoula, Montana, USA
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Madhav NK, Wagoner KD, Douglass RJ, Mills JN. Delayed density-dependent prevalence of Sin Nombre virus antibody in Montana deer mice (Peromyscus maniculatus) and implications for human disease risk. Vector Borne Zoonotic Dis 2008; 7:353-64. [PMID: 17767405 DOI: 10.1089/vbz.2006.0605] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
American hantaviruses cause a severe respiratory disease known as hantavirus pulmonary syndrome (HPS). In the United States, Sin Nombre virus (SNV), carried by the deer mouse ( Peromyscus maniculatus), is the etiologic agent in the majority of HPS cases. The relationship between deer mouse population density and SNV infection prevalence in deer mice is poorly understood. Our purpose was to clarify this relationship by demonstrating the existence of delayed-density-dependent prevalence of SNV infection in populations of wild deer mice. We also explored the relationship between SNV infection in deer mouse populations and the incidence of human HPS. The study population was 3,616 deer mice captured on 10 mark-recapture grids in Montana during May and September, 1994-2004. Using multivariate logistic regression analysis, we found a strong association between deer mouse population density in fall (September) and SNV antibody prevalence in deer mice the following spring (May). Other characteristics associated with SNV infection in deer mice in spring were: (1) presence of at least one infected deer mouse in the population the previous fall, (2) male gender, (3) adult age class, (4) presence of scars, (5) grassland and logged habitats, and (6) elevations below 1,300 m. There was a strong association between concurrently measured SNV antibody prevalence in deer mice and probable exposure of human HPS cases during the same time period. Human cases were more likely to occur during seasons when SNV antibody prevalence was at least 10% in deer mouse populations. These findings suggest that fall rodent population parameters could be used to help guide prevention efforts the following spring.
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Affiliation(s)
- Nita K Madhav
- Special Pathogens Branch, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
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Calisher CH, Wagoner KD, Amman BR, Root JJ, Douglass RJ, Kuenzi AJ, Abbott KD, Parmenter C, Yates TL, Ksiazek TG, Beaty BJ, Mills JN. Demographic factors associated with prevalence of antibody to Sin Nombre virus in deer mice in the western United States. J Wildl Dis 2007; 43:1-11. [PMID: 17347388 DOI: 10.7589/0090-3558-43.1.1] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We used long-term data collected for up to 10 yr (1994-2004) at 23 trapping arrays (i.e., webs and grids) in Arizona, Colorado, Montana, and New Mexico to examine demographic factors known or suspected to be associated with risk of infection with Sin Nombre virus (SNV) in its natural host, the deer mouse (Peromyscus maniculatus). Gender, age (mass), wounds or scars, season, and local relative population densities were statistically associated with the period prevalence of antibody (used as a marker of infection) to SNV in host populations. Nevertheless, antibody prevalence and some of the risk factors associated with antibody prevalence, such as relative population density, gender bias, and prevalence of wounding, varied significantly among sites and even between nearby trapping arrays at a single site. This suggests that local microsite-specific differences play an important role in determining relative risk of infection by SNV in rodents and, consequently, in humans. Deer mouse relative population density varied among sites and was positively and statistically associated with infection prevalence, an association that researchers conducting shorter-term studies failed to demonstrate. Both wounding and antibody prevalence increased with mass class in both males and females; this increase was much more pronounced in males than in females and wounding was more frequent in adult males than in adult females. Prevalence of wounding was greatest among seropositive deer mice, regardless of mass class, but many deer mice without detectable wounds or scars eventually became infected. Many of these patterns, which will be useful in the development of predictive models of disease risk to humans, were only detected through the application of data collected over a long (10-yr) period and with abundant replication.
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Affiliation(s)
- Charles H Calisher
- Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Foothills Campus, Colorado State University, Fort Collins, Colorado 80523, USA.
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Douglass RJ, Calisher CH, Wagoner KD, Mills JN. SIN NOMBRE VIRUS INFECTION OF DEER MICE IN MONTANA: CHARACTERISTICS OF NEWLY INFECTED MICE, INCIDENCE, AND TEMPORAL PATTERN OF INFECTION. J Wildl Dis 2007; 43:12-22. [PMID: 17347389 DOI: 10.7589/0090-3558-43.1.12] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Sin Nombre virus (SNV), hosted by the deer mouse (Peromyscus maniculatus), is the principal cause of hantavirus pulmonary syndrome (HPS) in North America. To improve our understanding of factors that contribute to the occurrence of HPS, we conducted an extensive field study of the characteristics of newly infected (as determined by recent acquisition of antibody) deer mice and the temporal pattern of antibody acquisition (seroconversion) from 1994 through 2004 in Montana, USA. We sampled 6,584 individual deer mice, of which 2,747 were captured over multiple trapping periods. Among these 2,747 deer mice, we detected 171 instances of seroconversion. There was no relationship between seroconversion and the acquisition of scars. However, recently infected Montana deer mice were more likely to be older, more likely to be males, and more likely to be in breeding condition. In addition, recently infected male deer mice gained less weight over the 1-mo period following seroconversion than did those that did not acquire antibody, suggesting that SNV infection may have negatively impacted the health of infected rodents. Incidence was highly variable among years, and timing of infections was primarily associated with the breeding season (generally early spring through late fall).
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Affiliation(s)
- Richard J Douglass
- Department of Biology, Montana Tech, 1300 West Park, Butte, Montana 59701, USA.
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Douglass RJ, Semmens WJ, Matlock-Cooley SJ, Kuenzi AJ. Deer Mouse Movements in Peridomestic and Sylvan Settings in Relation to Sin Nombre Virus Antibody Prevalence. J Wildl Dis 2006; 42:813-8. [PMID: 17255448 DOI: 10.7589/0090-3558-42.4.813] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Prevalence of antibody to Sin Nombre virus (SNV) has been found to be nearly twice as high in deer mice (Peromyscus maniculatus) in peridomestic settings as in sylvan settings in two studies in Montana and one in New Mexico. We investigated whether this difference may be related to a difference in deer mouse movements in the two settings. We used radiotelemetry to determine home range size and length of movement for 22 sylvan (1991-1992) and 40 peridomestic deer mice (1995-1999). We also determined the percentage of locations inside versus outside of buildings for peridomestic mice. Though variable, average home range size for female deer mice was significantly smaller for peridomestic deer mice than for sylvan deer mice. The smaller home range in peridomestic settings may concentrate shed SNV, and protection from solar ultraviolet radiation inside buildings may increase environmental persistence of SNV. Both these factors could lead to increased SNV exposure of deer mice within peridomestic populations and result in higher antibody prevalence. Peridomestic deer mice moved between buildings and outside areas, which is evidence that SNV can be transmitted between peridomestic and sylvan populations.
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Affiliation(s)
- Richard J Douglass
- Department of Biology, Montana Tech, University of Montana, 1300 West Park St., Butte, Montana 59701, USA.
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Abstract
Infections with hantaviruses in the natural host rodent may result in persistent, asymptomatic infections involving shedding of virus into the environment. Laboratory studies have partially characterized the acute and persistent infection by Sin Nombre virus (SNV) in its natural host, the deer mouse (Peromyscus maniculatus). However, these studies have posed questions that may best be addressed using longitudinal studies involving sequential sampling of individual wild-caught, naturally infected mice. Using enzyme immunoassay and polymerase chain reaction (PCR) analysis of monthly blood samples, we followed the infection status of deer mice in a mark-recapture study in Montana for 2 yr. Only six of 907 samples without IgG antibody to SNV contained detectable SNV RNA, suggesting that there is a very brief period of viremia before the host develops detectable antibody. The simultaneous presence of both antibody and viral RNA in blood was detected in consecutive monthly samples for as long as 3 mo. However, chronic infection was typified by alternating characteristics of PCR positivity and PCR negativity. Two possible interpretations of these results are that 1) viral RNA may be consistently present in the blood of chronically infected deer mouse, but that viral RNA is near the limits of PCR detectability or 2) SNV RNA sporadically appears in blood as a consequence of unknown physiological events. The occurrence of seasonal patterns in the proportion of samples that contains antibody and that also contained SNV RNA demonstrated a temporal association between recent infection (antibody acquisition) and presence of viral RNA in blood.
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Affiliation(s)
- Amy J Kuenzi
- Department of Biology, Montana Tech of the University of Montana, Butte, MT, USA.
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Abstract
We investigated geographic disparity in numbers of hantavirus pulmonary syndrome (HPS) cases in the United States. The 12-year incidences of HPS (cases/100,000 for total and rural residents) by state did not parallel the number of cases per state. The state with the greatest overall incidence was New Mexico, with Montana ranking second. When rural incidence based on rural human population sizes were compared, New Mexico also had the highest incidence, but Utah, Nevada, Montana, Arizona, and Colorado, in that order, also had high incidences. From these evaluations, it is clear that, in order to allow a precise risk assessment of acquiring HPS, we must first understand the host-virus cycle and we must have data regarding more exact conditions of human behaviors and exposure to the etiologic agent.
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Abstract
Trapping and removing deer mice from ranch buildings resulted in an increased number of mice, including Sin Nombre virus antibody-positive mice, entering ranch buildings. Mouse removal without mouse proofing will not reduce and may even increase human exposure to Sin Nombre hantavirus.
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Douglass RJ, Wilson T, Semmens WJ, Zanto SN, Bond CW, Van Horn RC, Mills JN. Longitudinal studies of Sin Nombre virus in deer mouse-dominated ecosystems of Montana. Am J Trop Med Hyg 2001; 65:33-41. [PMID: 11504405 DOI: 10.4269/ajtmh.2001.65.33] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Sin Nombre virus (SNV), hosted by the deer mouse (Peromyscus maniculatus), is the primary etiologic agent of Hantavirus pulmonary syndrome (HPS) in North America. To improve our understanding of the epidemiology of HPS in the western United States, we conducted studies of population dynamics and SNV antibody prevalence in deer mouse populations for 6 years on 12 mark-recapture grids in Montana. Monthly numbers of deer mice ranged from zero to over 170 on 1-hectare grids. SNV antibody prevalence was higher than observed in studies in other parts of the United States, averaging 13% (0% to 50%), and peaking in May or June each year. Antibody-positive mice were older (heavier) (78% of positives were adults versus 52% of negatives) and more likely to be males (61% of positives versus 53.4% of negatives). A higher proportion of antibody-positive deer mice of all age-mass classes had scars than did antibody-negative mice. Month-to-month survivorship of antibody-positive adult mice was similar to that of antibody-negative mice, but survival of young antibody-positive deer mice was lower than antibody-negative deer mice. This is the first study to clearly suggest a detrimental effect of SNV infection on deer mice.
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Affiliation(s)
- R J Douglass
- Department of Biology, Montana Tech of the University of Montana, Butte 59701, USA
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Kuenzi AJ, Douglass RJ, White D, Bond CW, Mills JN. Antibody to sin nombre virus in rodents associated with peridomestic habitats in west central Montana. Am J Trop Med Hyg 2001; 64:137-46. [PMID: 11442208 DOI: 10.4269/ajtmh.2001.64.137] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Most human cases of hantavirus pulmonary syndrome are acquired in the peridomestic environment, yet studies of the ecology and infection dynamics in the reservoir host, the deer mouse (Peromyscus maniculatus), have focused on sylvan populations. We describe a 2.5-year study of hantavirus infection in rodents associated with peridomestic habitats in west central Montana. Antibodies reactive with Sin Nombre virus (SNV) were found in five species. Overall SNV antibody prevalence was highest among deer mice (25% of individuals tested). As has been demonstrated for sylvan populations, the antibody-positive component of the deer mouse population consisted of a higher proportion of adults and males. However, the prevalence of antibodies to SNV was higher in this study than has been reported in most sylvan studies. The average monthly proportion of deer mouse blood samples with antibodies to SNV ranged from approximately 20% to 25% and was highest in the late spring/early summer. The higher SNV antibody prevalence in peridomestic compared with sylvan settings may be related to behavioral differences and/or potentially longer survival of the virus deposited inside buildings. Peridomestic settings presented higher concentrations of virus and may present a higher risk of human infection than do sylvan settings.
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Affiliation(s)
- A J Kuenzi
- Department of Biology, Montana Tech of the University of Montana, Butte 59701, USA
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Abstract
Handling mortality and recapture rates of wild rodents that were bled from the retroorbital capillary plexus without anesthesia were assessed. In 9,670 captures of seven species of rodents from 1994 through 1998, we found no difference in handling mortality in bled mice compared to those from trapping grids where mice were not bled. Recapture rates of rodents on control (non-bleeding grids) and rodents on bleeding grids was not significantly different for any species. We conclude that bleeding in the absence of anesthesia does not affect immediate mortality or subsequent recapture.
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Affiliation(s)
- R J Douglass
- Department of Biology, Montana Tech of the University of Montana, Butte 59701, USA.
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Abstract
From 1996 through 1999, 35 deer mice (Peromyscus maniculatus) were captured in 25 urban and suburban homes in southwestern Montana. Mice were captured throughout the year except for January; seven mice (20%) from seven (28%) of the homes were seropositive for Sin Nombre virus. The infected mice were mostly adult males captured in the spring and fall.
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Affiliation(s)
- A J Kuenzi
- Department of Biology, Montana Tech of the University of Montana, Butte, Montana 59701, USA.
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Abstract
Dynamics of small mammal populations and the prevalence of antibodies for hantavirus were determined in six locations in central and western Montana (USA). Eighteen live-trapping grids were trapped monthly from June through September 1994. Deer mouse (Peromyscus maniculatus) populations ranged from 0 to over 90 on one-hectare grids. Our bleeding technique had no apparent effect on survival of deer mice. Deer mice, meadow voles (Microtus pennsylvanicus), and sagebrush voles (Lagurus curtatus) were seropositive. Thirty-eight (8%) (range, 0% to 30%) of 471 deer mice were seropositive for hantavirus antibodies. Seropositive mice were older and had lower monthly survival rates than seronegative deer mice. We found no relationship between prevalence of hantavirus antibodies and population density.
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Affiliation(s)
- R J Douglass
- Department of Biology, Montana Tech, Butte 59701, USA
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Douglass RJ, Douglass KS, Rossi L. Ecological distribution of bank voles and wood mice in disturbed habitats: preliminary results. ACTA ACUST UNITED AC 1992. [DOI: 10.4098/at.arch.92-37] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Douglass RJ. Effects of Radio-collaring on Deer Mouse Survival and Vulnerability to Ermine Predation. American Midland Naturalist 1992. [DOI: 10.2307/2426335] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Douglass RJ. A Method for Examining Dental Characteristics of Live Rodents. American Midland Naturalist 1976. [DOI: 10.2307/2424086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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