sentence: Two strains were not identified by Vitek 2C system , the reason for which may be attributed to the unavailability of data for possible Staphylococcus species in its database.The coagulase-negative S. aureus may probably be MRSA isolates , which are reported to react weakly or negatively with TCTs , [ 8] or rare S. aureus strains that are reported to be coagulase-negative .