A new paper by Gwij Stegen et al. shows that the salamander chytrid fungus may be the 'perfect pathogen'. It kills salamanders rapidly and has a very high transmission. There is apparently no immune response by the salamader. There are reservoir hosts and two types of zoospores.
An infected salamander. Picture by (c) Frank Pasmans.
The paper in Nature.
The News and Views article by Mat Fisher.
The story in Science about the article.