Abstract
It has long been theorized that deer mice (Peromyscus maniculatus) are a primary reservoir of Yersinia pestis in California. However, recent research from other parts of the western USA has implicated deer mice as spillover hosts during epizootic plague transmission. This retrospective study analyzed deer mouse data collected for plague surveillance by public health agencies in California from 1971 to 2016 to help elucidate the role of deer mice in plague transmission. The fleas most commonly found on deer mice were poor vectors of Y. pestis and occurred in insufficient numbers to maintain transmission of the pathogen, while fleas whose natural hosts are deer mice were rarely observed and even more rarely found infected with Y. pestis on other rodent hosts. Seroprevalence of Y. pestis antibodies in deer mice was significantly lower than that of several chipmunk and squirrel species. These analyses suggest that it is unlikely that deer mice play an important role in maintaining plague transmission in California. While they may not be primary reservoirs, results supported the premise that deer mice are occasionally exposed to and infected by Y. pestis and instead may be spillover hosts.
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Acknowledgements
We thank Dr. Anne Kjemtrup (CDPH-VBDS) and Dr. Ken Gage (Centers for Disease Control and Prevention) for reviewing this manuscript. We also thank all current and former CDPH-VBDS staff and employees of many local, state, and federal agencies who contributed to the collection of the plague surveillance data. Finally, we acknowledge the efforts of Robert Dugger who assisted us with digitizing historical data.
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Danforth, M., Tucker, J. & Novak, M. The Deer Mouse (Peromyscus maniculatus) as an Enzootic Reservoir of Plague in California. EcoHealth 15, 566–576 (2018). https://doi.org/10.1007/s10393-018-1337-2
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DOI: https://doi.org/10.1007/s10393-018-1337-2