 TSST-1 is the cause of 50% of non-menstrual and 100% of all menstrual TSS cases.In the nucleotide sequence of TSST-1, there is a 708 base-pair open-reading frame and a Shine-Dalgarno sequence which is seven base pairs downstream from the start site.In the entire nucleotide sequence, only 40 amino acids make up the signal peptide.