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Table 1 Colony forming units of S. aureus shed per adult

From: Shedding of Staphylococcus aureus and methicillin-resistant Staphylococcus aureusfrom adult and pediatric bathers in marine waters

  Group I Group II Average  
Cycle (BP) (CHR) (BP) (CHR) (BP) (CHR) (CHR)
1 1.3 × 106 8.1 × 105 *1.4 × 105 BDL 7.1 × 105 4.1 × 105 6.1 × 106
2 8.3 × 105 8.1 × 105 4.6 × 104 BDL 4.4 × 105 4.1 × 105 3.9 × 106
3 9.1 × 105 4.2 × 105 *1.0 × 106 *4.3 × 105 9.6 × 105 4.3 × 105 1.3 × 106
4 3.6 × 105 8.1 × 104 *4.3 × 105 *4.5 × 105 3.9 × 105 2.6 × 105 6.8 × 105
Average 8.4 × 105 5.3 × 105 4.1 × 105 2.2 × 105 6.3 × 105 3.8 × 105 3.0 × 106
Standard Deviation 3.8 × 105 3.5 × 105 4.4 × 105 2.5 × 105 2.7 × 105 7.6 × 104 2.5 × 106
  1. *Water samples where MRSA was detected.
  2. Based on analysis of water samples from a large pool with 10 adults using two different selective media, Baird Parker (BP) and Chromagar (CHR); numbers shown correspond to confirmed numbers of S. aureus based upon detection of the specific gyrA gene. BDL = below detection limit. BDLs were transformed to 1/2 of BDLs in order to estimate averages and standard deviations. The theoretical detection limit (2.8 × 103 CFU/person) can be calculated from the volume of the large pool (1400 L), the largest membrane filtration volume (50 ml) and noting that 10 people bathed per cycle (adapted Elmir et al. [17]).