TST and infectious disease: Amongst all virulence markers found in the S. epidermidis strains, genes encoding clumping factor (clfA), IgG-binding region, toxic shock syndrome toxin (tst), exfoliative toxins (eta and etb), accessory gene regulator (agr), and X-region were recognized as the most important markers in occurrence of infectious diseases caused by S. epidermidis [10].