Totaro Michele, Valentini Paola, Costa Anna Laura, Frendo Lorenzo, Cappello Alessia, Casini Beatrice, Miccoli Mario, Privitera Gaetano, Baggiani Angelo
Department of Translational Research N.T.M.S., University of Pisa, 56126 Pisa, Italy.
Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy.
Int J Environ Res Public Health. 2017 Oct 26;14(11):1296. doi: 10.3390/ijerph14111296.
Although the European reports highlight an increase in community-acquired Legionnaires' disease cases, the risk of spp. in private houses is underestimated. In Pisa (Italy) we performed a three-year survey on Legionella presence in 121 buildings with an independent hot water production (IB); 64 buildings with a central hot water production (CB); and 35 buildings with a solar thermal system for hot water production (TB). From all the 220 buildings spp. was researched in two hot water samples collected either at the recirculation point or on the first floor and on the last floor, while the potable water quality was analysed in three cold water samples collected at the inlet from the aqueduct network, at the exit from the autoclave, and at the most remote tap. sg1, sg2-16, and non- species were detected in 26% of the hot water networks, mostly in CB and TB. In these buildings we detected correlations between the presence of and the total chlorine concentration decrease and/or the increase of the temperature. Cold water resulted free from microbiological hazards, with the exception of and isolated at the exit from two different autoclaves. We observed an increase in total microbial counts at 22 °C and 37 °C between the samples collected at the most remote taps compared to the ones collected at the inlet from the aqueduct. The study highlights a condition of potential risk for susceptible categories of population and supports the need for measures of risk assessment and control.
尽管欧洲的报告强调社区获得性军团病病例有所增加，但私人住宅中军团菌属的风险被低估了。在意大利比萨，我们对121座有独立热水供应系统（IB）的建筑、64座有集中热水供应系统（CB）的建筑以及35座有太阳能热水系统（TB）的建筑进行了为期三年的军团菌存在情况调查。在所有220座建筑中，从循环点或一楼及顶楼采集的两份热水样本中检测军团菌属，同时在从输水网络入口、高压灭菌器出口以及最远端水龙头采集的三份冷水样本中分析饮用水质量。在26%的热水网络中检测到嗜肺军团菌1型、嗜肺军团菌2 - 16型以及非嗜肺军团菌属，大多在CB和TB中。在这些建筑中，我们检测到军团菌的存在与总氯浓度降低和/或温度升高之间存在相关性。除了在两个不同高压灭菌器出口分离出的嗜肺军团菌和米克戴德军团菌外，冷水未出现微生物危害。与从输水网络入口采集的样本相比，我们观察到在最远端水龙头采集的样本在22℃和37℃时总微生物数量增加。该研究突出了易感人群面临的潜在风险状况，并支持进行风险评估和控制措施的必要性。
