Results: Prevalences of S epidermidis isolated on the umbilicus at three-time points: 33.1% (1st time); 10.2% (2nd time) and 1.8% (3rd time). Prevalences of S epidermidis isolated on the groin at three-time points: 32.7% (1st time); 9.6% (2nd time) and 1.9% (3rd time).