We report the case of a young psychotic intravenous drug user injecting herself with Saccharornyces cervisiae (boulardii). She experienced a 24 h fever, resolving spontaneously confirming, quasi experimentally, the inocuity of this yeast in a non-immunocompromisecl host. (C) 2013 International Society for Human and Animal Mycology. Published by Elsevier B.V