Globally,<unk>  is fairly rare. In the United States, for example, an average of 110 cases are reported each year.  Of these, roughly 70% are infant<unk> , 25% are foodborne<unk> , and 5% are wound<unk> . The number of cases of food borne and infant<unk>  has changed little in recent years, but wound<unk>  has increased because of the use of black tar heroin, especially in California. Wound<unk>  may be caused even by inhaled cocaine.
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