American Bullfrogs (Lithobates catesbeianus) Resist Infection by Multiple Isolates of Batrachochytrium dendrobatidis, Including One Implicated in Wild Mass Mortality
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The emerging amphibian disease chytridiomycosis varies in severity depending on host species. Within species, disease susceptibility can also be influenced by pathogen variation and environmental factors. Here, we report on experimental exposures of American bullfrogs (Lithobates catesbeianus) to three different isolates of Batrachochytrium dendrobatidis (Bd), including one implicated in causing mass mortality of wild American bullfrogs. Exposed frogs showed low infection prevalence, relatively low infection load, and lack of clinical disease. Our results suggest that environmental cofactors are likely important contributors to Bd-associated American bullfrog mortality and that this species both resists and tolerates Bd infection.
Keywordschytridiomycosis resistance tolerance susceptibility carrier Rana catesbeiana
We thank H. Baghoyan and S. Krycia for their invaluable help with animal husbandry and histology, respectively. All work was conducted using experimental procedures approved by the UC Davis Institutional Animal Care and Use Committee under protocol #16444. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. 1148897 to EAE.
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