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An 8-month-old infant presented with pneumonia and pleural effusion associated with clinical manifestation of toxic shock syndrome. A Staphylococcus aureus strain isolated from the pleural fluid produced enterotoxin C, but not toxic shock syndrome toxin-1 or other enterotoxins. Acute and convalescent sera showed an antibody rise to enterotoxin C but not to toxic shock syndrome toxin-1. These findings support the possibility that enterotoxin C was the primary toxin associated with this infant's illness.
Munir F. Rizkallah (Sat,) studied this question.