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. 1987 Feb;25(2):327–332. doi: 10.1128/jcm.25.2.327-332.1987

Detection and quantitation of toxic shock syndrome toxin 1 in vitro and in vivo by noncompetitive enzyme-linked immunosorbent assay.

P M Rosten, K H Bartlett, A W Chow
PMCID: PMC265894  PMID: 3818927

Abstract

Toxic shock syndrome toxin 1 (TSST-1), an exotoxin produced by many Staphylococcus aureus strains, is implicated as the prime causal agent of toxic shock syndrome (TSS). A sensitive and specific noncompetitive enzyme-linked immunosorbent assay (ELISA) capable of detecting TSST-1 at concentrations from 0.5 to 16 ng/ml was developed. This assay did not detect other staphylococcal enterotoxins including A, B, C1, C2, C3, D, and E. Possible interactions with protein A were readily eliminated by pretreatment of test samples with 10% normal rabbit serum. The assay was adapted for rapid screening of TSST-1 production by S. aureus isolates in culture supernatants in vitro and for detection of TSST-1 in vaginal washings of TSS patients and healthy controls in vivo. All 35 S. aureus isolates confirmed to be TSST positive by Ouchterlony immunodiffusion and 59 of 60 isolates confirmed to be TSST-1 negative gave concordant results by ELISA. Interestingly, toxigenic S. aureus strains isolated from TSS patients quantitatively produced significantly more TSST-1 in vitro compared with toxigenic control strains (P less than 0.05, Mann-Whitney rank sum test). TSST-1 could be detected by ELISA in three of four vaginal washings collected within 3 days of hospitalization from three women with acute menstrual TSS, compared with 0 of 17 washings from nine TSS patients hospitalized longer than 3 days (P = 0.003, Fisher's exact test) and 1 of 15 washings from 14 healthy control women (P = 0.016). This noncompetitive ELISA should be particularly useful for rapid screening of TSST-1 production by S. aureus isolates, for the purification and biochemical characterization of TSST-1, and for human and animal studies of the pathogenesis of TSS.

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Selected References

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