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Table 2

Relationship between P. aeruginosa-positive PMA-qPCR and the TVCs

TVCsDUWL water samples (n)P. aeruginosa PMA-qPCR (n)Tap water samples (n)P. aeruginosa PMA-qPCR (n)
Drinking water thresholda 20 
102–3 × 103CFU/mL 31 
>3 × 103 CFU/mL 26 11 
Total 60 14 26 
TVCsDUWL water samples (n)P. aeruginosa PMA-qPCR (n)Tap water samples (n)P. aeruginosa PMA-qPCR (n)
Drinking water thresholda 20 
102–3 × 103CFU/mL 31 
>3 × 103 CFU/mL 26 11 
Total 60 14 26 

aThreshold values established by the European Council Directive 98/83/E: <20 CFU/mL at 36 °C and <100 CFU/mL at 22 °C (Mantel–Haenszel chi-square test for trend = 7,18, p = 0.007386).

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