Journal of environmental health · 2015
Legionnaires' Disease Outbreak at a Long-Term Care Facility Caused by a Cooling Tower Using an Automated Disinfection System--Ohio, 2013.
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Quinn Celia, Demirjian Alicia, Watkins Louise Francois, Tomczyk Sara, Lucas Claressa, Brown Ellen, Kozak-Muiznieks Natalia, Benitez Alvaro, Garrison Laurel E, Kunz Jasen, Brewer Scott, Eitniear Samantha, DiOrio Mary
Аннотация
On July 9, 2013, an outbreak of Legionnaires' disease (LD) was identified at Long-Term Care Facility A in central Ohio. This article describes the investigation of the outbreak and identification of the outbreak source, a cooling tower using an automated biocide delivery system. In total, 39 outbreak LD cases were identified; among these, six patients died. Water samples from a cooling tower were positive for Legionella pneumophila serogroup 1, reactive to monoclonal antibody 2, with matching sequence type to a patient isolate. An electronic control system turned off cooling tower pumps during low-demand periods, preventing delivery of disinfectant by a timed-release system, and leading to amplification of Legionella in the cooling tower. Guidelines for tower maintenance should address optimal disinfection when using automated systems.