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
J Environ Health. 2015 Dec;78(5):8-13.
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.
2013年7月9日，俄亥俄州中部的长期护理机构A发现了一起军团病（LD）疫情。本文描述了对此次疫情的调查以及疫情源头的确定，源头是一座使用自动杀菌剂输送系统的冷却塔。总共确定了39例疫情相关的军团病病例；其中6名患者死亡。冷却塔的水样中嗜肺军团菌血清1型呈阳性，与单克隆抗体2发生反应，序列类型与一名患者的分离株匹配。电子控制系统在需求较低期间关闭了冷却塔水泵，阻止了定时释放系统输送消毒剂，导致冷却塔中军团菌大量繁殖。冷却塔维护指南应涉及使用自动化系统时的最佳消毒方法。
