Host size influences the effects of four isolates of an amphibian chytrid fungus.

Understanding factors that influence host-pathogen interactions is key to predicting outbreaks in natural systems experiencing environmental change. Many amphibian population declines have been attributed to an amphibian chytrid fungus, (). While this fungus is widespread, not all positive populations have been associated with declines, which could be attributed to differences in pathogen virulence or host susceptibility.