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Serum antibody responses to toxic shock syndrome (TSS) toxin 1 (TSST-1) and staphylococcal enterotoxins A, B, and C were determined by western blot (immunoblot) analysis of acute- and convalescent-phase paired sera from 18 TSS- and 31 non-TSS-associated Staphylococcus aureus infections. Compared with non-TSS cases, seroconversion to TSST-1 was significantly more frequent among both menstrual (5 of 8 versus 1 of 31; P less than 0.001) and nonmenstrual (3 of 10; P less than 0.05) patients. Seroconversion to staphylococcal enterotoxin A was also more frequent among both menstrual (2 of 8 versus 0 of 31; P less than 0.05) and nonmenstrual (2 of 9; P less than 0.05) TSS patients. In general, patients with TSS associated with TSST-1-positive S. aureus were more likely to seroconvert exclusively to TSST-1 (4 of 12 versus 0 of 6; P = 0.16), whereas those associated with TSST-1-negative S. aureus were more likely to seroconvert exclusively to enterotoxins (3 of 6 versus 0 of 11; P less than 0.05). Concurrent seroconversions to multiple exoproteins were more frequent among both menstrual (3 of 8; P less than 0.05) and nonmenstrual (2 of 9; P less than 0.05) TSS patients compared with persons without TSS (0 of 31). These data suggest but do not prove that enterotoxins (especially staphylococcal enterotoxin A) in addition to TSST-1 may be involved in both menstrual and nonmenstrual TSS. Furthermore, since exposure to multiple exoproteins is more likely to occur during TSS-associated than non-TSS-associated S. aureus infections, the possibility of additive or synergistic effects of these putative toxins in the pathogenesis of TSS should be further explored.

infection and immunity

Determination by western blot (immunoblot) of seroconversions to toxic shock syndrome (TSS) toxin 1 and enterotoxin A, B, or C during infection with TSS- and non-TSS-associated Staphylococcus aureus