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Table 1 Results of filtration studies involving S. aureus, S. epidermidis, S. lugdunensis, E. coli and B. cereus grown in BHI broth and examined under different conditions of growth.

From: Filterability of staphylococcal species through membrane filters following application of stressors

Organism Growth conditions
  Fresh cultures
(109)
Old cultures (11 wks)
(109)
4°C
(109)
10% NaCl
(108)
pH 5
(108)
VA 100 µg ml-1
(108)
Pen G 100 µg ml-1
(108)
  0.22 µm 0.45 µm 0.22 µm 0.45 µm 0.22 µm 0.45 µm 0.22 µm 0.45 µm 0.22 µm 0.45 µm 0.22 µm 0.45 µm 0.22 µm 0.45 µm
S. aureus 1.7 ± 1.9 0.3 ± 0.6 0.1 ± 0.3 12.2 ± 36.3 6 ± 17 4 ± 6 - 38.5 ± 40.8 - 10.5 ± 11.4 - - - -
S. epidermidis - 57.8 ± 53.6 0.1 ± 0.3 5.4 ± 15.2 - - - 3.9 ± 8.7 - 5.5 ± 5.5 - - - -
S. lugdunensis 0.7 ± 1.4 185.3 ± 46.4 0.4 ± 1.3 101.4 ± 247 23 ± 41 19 ± 40 - 166.3 ± 140.5 - 140.1 ± 112.9 - 23 ± 31.1 - -
B. cereus - - - - - - - - - - - - - -
E. coli - - - - - - - - - - - - - -
  1. -, no passage recorded; VA-vancomycin; PEN G-penicillin G
  2. Results are represented as mean values of replicate experiments ± SD in colony forming units per mL (cfu/mL).