Efficacy of the detection of Legionella in hot and cold water samples by culture and PCR. I. Standardization of methods

Angelina Wójcik-Fatla 1, Nimfa Maria Stojek 2, Jacek Dutkiewicz 1
1 - Department of Zoonoses, Institute of Rural Health, Lublin, Poland
2 - Department of Water and Soil Safety, Institute of Rural Health, Lublin, Poland
Ann Agric Environ Med
2012; 19 (2):
ICID: 1001811
Article type: Original article
The aim of the present study was: – to compare methods for concentration and isolation of Legionella DNA from water; – to examine the efficacy of various modifications of PCR test (PCR, semi-nested PCR, and real-time PCR) for the detection of known numbers of Legionella pneumophila in water samples artificially contaminated with the strain of this bacterium and in randomly selected samples of environmental water, in parallel with examination by culture. It was found that filtration is much more effective than centrifugation for the concentration of DNA in water samples, and that the Qiamp DNA Mini-Kit is the most efficient for isolation of Legionella DNA from water. The semi-nested PCR and real-time PCR proved to be the most sensitive methods for detection of Legionella DNA in water samples. Both PCR modifications showed a high correlation with recovery of Legionella by culture (p<0.01), while no correlation occurred between the results of one-stage PCR and culture (p>0.1).
PMID 22742804 - click here to show this article in PubMed

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