(i) If the Ct value was equal to or lower than the mean Ct value of the series +1SD, it was recorded as ''correct detection of the phage'' (CDP), and associated with the absence of detectable inhibitor or technical problem while processing the corresponding sample. (ii) If the Ct value was higher than the mean Ct value of the series +1SD (or undetectable), it was recorded as ''inefficient detection of the phage'' (IDP), and associated with the presence of amplification inhibitor(s) or technical problem while processing the corresponding sample.