FIGURE 1.
Distribution of titer of toxic shock syndrome toxin-1 (TSST-1) produced in 157 TSST-1-producing clinical isolates of Staphylococcus aureus cultured in (A) Todd Hewitt (TH) medium or (B) TH medium supplemented with horse serum. The titer of TSST-1 was determined by using the passive latex agglutination kit. The results of a single representative experiment carried out with three technical replicates are shown. Note that unimodal distribution of TSST-1 titers turned into bimodal distribution when the strains were cultured in the medium supplemented with horse serum.
