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Microscopy of the skin of a fire salamander that died due to infection with B. salamandrivorans. (A) Immunohistochemical staining of a 5-µm skin section. Intracellular colonial thalli abound throughout all epidermal cell layers and are associated with erosive lesions. (Scale bar, 20 µm.) (B) Transmission electron microscopy picture of an intracellular colonial thallus of B. salamandrivorans inside a keratinocyte (Scale bar, 4 µm.) Photo courtesy of Proc Natl Acad Sci U S A. Sep 17, 2013; 110(38): 15325–15329. Published online Sep 3, 2013. doi: 10.1073/pnas.1307356110