Shifts in disease dynamics in a tropical amphibian assemblage are not due to pathogen attenuation

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Science  30 Mar 2018:
Vol. 359, Issue 6383, pp. 1517-1519
DOI: 10.1126/science.aao4806

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  • Epizootic-enzootic transition in chytridiomycosis are temperature dependent events.

    Voyles et al. (1) report that epizootic-enzootic transition of Batrachochytrium dendrobatidis (Bd) infection in amphibians has driven from host factors rather than attenuation of Bd pathogenicity (1). Although the found similarities between historic and contemporary Bd isolates for their growth rates, zoosporangium sizes and infection densities have been investigated profoundly (1), but the imperative roles of host immunity and environmental factors specifically temperature are not defined well. Amphibians body temperature depends on season and exposure to temperature >25 °C at which Bd does not grow depends on animal behavior (2, 3). Variations in temperature lead a transitional shift in host microbiota and that have survival benefit to host or to the pathogen (4). Voyles et al have investigated on a total of 9 bacteria-genus, with confirmed anti-Bd effects, however, they haven't emphasized upon seasonal ambient temperature through which swab samples were collected. Earlier reports state that transition of the season from warm-wet to cool-dry remarkably modulates frogs skin microbiota (4), that modulates host-pathogen interactions between Bd and amphibians. Although Voyles et al. (1) have shown that amphibians have accustomed to amphibians favorable microbiota, evidenced by demonstrated anti-Bd skin secretions of seven amphibians. However, they have not presented any data that could demonstrate microbial species diversity in these skin secretions taken from repre...

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    Competing Interests: None declared.