I am interested in how composition of parasite and the amphibian host assemblages affect disease dynamics. Amphibians are exposed to a wide range of macroparasites and microparasites, each with its own distinct pathology and niche within hosts. Disease outcome may differ for different combinations of parasites, and be further complicated when coupled with different combinations of hosts with varying susceptibility. I plan to focus on three amphibian hosts: the Western toad, the Pacific chorus frog, and the invasive American bullfrog. I will be exposing different host combinations to several pathogens. These exposure experiments will allow me to parameterize population-level models to study the long term effects of multi-host and multi-pathogen interactions.