Table 4.

Bacteriophages infecting different B. fragilis strains, F-specific phages, and fecal coliforms in different types of sewage from Barcelona area (PFU per ml or CFU per ml)

Host strainBacteriophage result for urban sewage (n = 12)Bacteriophage result for slaughterhouse wastewater (n = 18)
Range (minimum–maximum)% Positive samplesArithmetic meanMedianRange (minimum–maximum)% Positive samplesArithmetic meanMedian
B. fragilisHSP403.2 × 101–1.9 × 102 1008.2 × 101 7.4 × 101 0–7.5 × 100 391 × 100 0
B. fragilisRYC40233.3 × 101–1.8 × 102 1009.3 × 101 9.6 × 101 0–1.6 × 101 281.4 × 100 0
B. fragilisRYC32344.6 × 101–1.9 × 102 1009.4 × 101 8.8 × 101 0–2.3 × 101 945.9 × 100 3.9 × 100
B. fragilisRYC20568.2 × 101–4.4 × 102 1002.4 × 102 2.1 × 102 2.9–2.4 × 102 1003.7 × 101 2.0 × 101
B. fragilisRYC33175.9 × 101–1.9 × 102 1001.5 × 102 1.4 × 102 1.4–2.0 × 102 1002.2 × 101 b 9.4 × 100
B. fragilisRYC33184.2 × 101–3.3 × 102 1001.7 × 102 1.5 × 102 0.2–7.8 × 101 1001.5 × 101 7 × 100
E. coliHS(pFamp)Ra 1.4 × 103–7.6 × 103 1004.1 × 103 3.6 × 103 1.6 × 102–1.7 × 105 1003.7 × 104 4.0 × 103
Fecal coliforms7.9 × 103–1.9 × 105 1006.3 × 104 6.0 × 104 2.0 × 104–6.8 × 106 1009.6 × 105 3.0 × 105
  • a Host strain for F-specific phages.

  • b n = 17.