![]() ![]() PCR is a valuable tool for identifying Legionella DNA in environmental samples in outbreak settings. PCR results were available <1 day after sample collection, and culture results were available as early as 5 days after plating. An isolate from a power plant cooling tower sample was indistinguishable from a patient isolate by pulsed-field gel electrophoresis, suggesting the cooling tower was the outbreak source. ![]() pneumophila serogroup 1 DNA only at a power plant cooling tower, supporting the decision to order remediation before culture results were available. To support a timely public health response, we used real-time polymerase chain reaction (PCR) to identify Legionella DNA in environmental samples within hours of specimen collection. Risk management is based on good maintenance practices, including a water. Possible environmental sources included two active cooling towers (air-conditioning units for large buildings) <1 km from patient residences, a market misting system, a community-wide water system used for heating and cooling, and potable water. WHY ARE COOLING TOWERS FAVOURABLE PLACES FOR THE GROWTH OF LEGIONELLA. We investigated an outbreak of eight Legionnaires’ disease cases among persons living in an urban residential community of 60,000 people. ![]()
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