Thrush is a disease of the foot that usually occurs within the frog (the wedge-shaped structure on the bottom surface of the foot) and its sulci (the grooves next to and in the middle of the frog). The disease is characterized by a very soft frog and sulci. When the frog is picked out, a thick, black discharge is present that is easily removed from the sulci. There also is a characteristically pungent odor. Once s
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