The fungus is supposedly spread by Xenopus frogs (African Clawed Frogs/Toads) who seem to be natural carriers of it (but largely immune to it). Due to their use in science and as pets throughout the world, the fungus has been spread to amphibians that would never otherwise have encountered it and thus die from it.

Treatments for it vary from lamasil (athlete's foot medication) to other fungicides and also things like Clorox for disinfecting equipment. Indicentally, Clorox are a major donor to Amphibian Ark, the worldwide organization/charity set up to save amphibian species in the wild. Caudata.org is running a donations drive for Amphibian Ark this month. If you want to save frogs in the wild from this fungus, consider joining in th donations drive (it's for all amphibian species).