Agarose gel electrophoresis patterns showing MPCR amplification products from different S. aureus and S. epidermidis isolates. Lane 1, negative control; lanes 2 and 3, mupirocin-resistant MRSA isolates; lanes 4 and 5, mupirocin-susceptible MRSA isolates; lane 6, mupirocin-intermediate MRSA isolate; lane 7, methicillin-resistant and mupirocin-resistant S. epidermidis isolate; lane 8, methicillin-susceptible and mupirocin-sensitive S. aureus strain (ATCC 29213); lane 9, methicillin-resistant and mupirocin-susceptible S. epidermidis isolate; lane 10, methicillin-susceptible and mupirocin-sensitive S. epidermidis isolate; lane M, DNA molecular size marker (100-bp ladder).