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Table 5 Comparison of action/alert levels using quantitative PCR (qPCR) and immunomagnetic separation based method (IMS) for Legionella spp

From: Comparing methods of determining Legionella spp. in complex water matrices

     IMS method no.
Legionellaspp    Action Alert Satisfactory Total
Hot/cold sanitary Cooling towers ≥10 4CFU l −1 ≥10 3CFU l −1 <10 3CFU l −1  
  Action ≥105 GU l−1 ≥106 GU l−1 10 2 0 12
qPCR no. Alert ≥104 GU l−1 ≥105 GU l−1 0 2 1 3
  Satisfactory <104 GU l−1 < 105 GU l−1 1 5 62 68
  Total    11 9 63 83