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Hot water systems as sources of Legionella pneumophila in hospital and nonhospital plumbing fixtures.

机译:热水系统是医院和非医院卫生设备中肺炎军团菌的来源。

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摘要

Samples obtained from plumbing systems of hospitals, nonhospital institutions and homes were cultured for Legionella spp. by plating the samples directly on a selective medium. Swab samples were taken from the inner surfaces of faucet assemblies (aerators, spouts, and valve seats), showerheads, and shower pipes. Water and sediment were collected from the bottom of hot-water tanks. Legionella pneumophila serogroups 1, 5, and 6 were recovered from plumbing fixtures of the hospitals and nonhospital institutions and one of five homes. The legionellae (7 to 13,850 colony-forming units per ml) were also present in water and sediment from hot-water tanks maintained at 30 to 54 degrees C, but not in those maintained at 71 and 77 degrees C. Legionella micdadei was isolated from one tank. Thus legionellae are present in hot-water tanks which are maintained at warm temperatures or whose design results in warm temperatures at the bottom of the tanks. We hypothesize that hot-water tanks are a breeding site and a major source of L. pneumophila for the contamination of plumbing systems. The existence of these bacteria in the plumbing systems and tanks was not necessarily associated with disease. The extent of the hazard of this contamination needs to be delineated.
机译:从医院,非医院机构和家庭的管道系统中获取的样本被培养成军团菌。通过将样品直接铺在选择性培养基上。拭子样本取自水龙头组件(曝气器,喷嘴和阀座),淋浴喷头和淋浴管的内表面。从热水箱底部收集水和沉积物。嗜肺军团菌血清群1、5和6是从医院和非医院机构的卫生设备以及五个住所之一中回收的。军团菌(每毫升7到13850个菌落形成单位)也存在于保持在30到54摄氏度的热水箱的水和沉积物中,但在保持在71到77摄氏度的热水箱中没有。军团菌分离自一辆战车因此,军团菌存在于热水箱中,该热水箱保持在温暖的温度下,或者其设计导致水箱底部处于温暖的温度。我们假设热水罐是繁殖管道和肺炎链球菌的主要污染源,用于污染管道系统。这些细菌在管道系统和水箱中的存在不一定与疾病有关。需要确定这种污染的危害程度。

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