Black piedra is found in soil, particularly in tropical areas. Also, it is mixed with coryneform bacteria and occasionally with Trichosporon spp. However, the infection also has been traced to organisms in stagnant water and crops. Munich in 1937 said that black piedra occurs in animals as well as in humans. Moreover, piedra was also found on the hairs of 5 out of 7 chimpanzee pelts from the Cameroon (6).
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