 The fungus is spread through the transportation of amphibious species by humans.Infected amphibians that have escaped or are released into the wild can carry the fungus and therefore invade the surrounding habitats of local species that are not immune to the disease.Species like the American Bullfrog and African Clawed Frog can carry this disease without experiencing symptoms or death; these kinds of species are usually to blame for the spread of the disease in undeveloped habitats.