Department of Translational Research N.T.M.S, University of Pisa, 56123 Pisa, Italy.
Division of Public Health and Nutrition, Area of Pisa, Azienda USL Toscana Nord Ovest, 56123 Pisa, Italy.
Int J Environ Res Public Health. 2020 Sep 26;17(19):7050. doi: 10.3390/ijerph17197050.
Despite an increase of literature data on spp. presence in private water systems, epidemiological reports assert a continuing high incidence of Legionnaires' disease infection in Italy. In this study, we report a survey on spp. colonization in 58 buildings with solar thermal systems for hot water production (TB). In all buildings, spp. presence was enumerated in hot and cold water samples. Microbiological potability standards of cold water were also evaluated. spp. was detected in 40% of the buildings. Moreover, we detected correlations between the count of spp. and the presence of the optimal temperature for the microorganism growth (less than 40 °C). Our results showed that cold water was free from microbiological hazards, but spp., was detected when the mean cold water temperature was 19.1 ± 2.2 °C. This may considered close to the suboptimal value for the growth (more then 20 °C). In conclusion, we observed the presence of a Legionnaires' disease risk and the need of some strategies aimed to reduce it, such as the application of training programs for all the workers involved in water systems maintenance.
尽管有关 spp. 在私人供水系统中存在的文献资料有所增加，但流行病学报告仍断言意大利军团病感染的发病率持续居高不下。在这项研究中，我们报告了对 58 栋带有太阳能热水系统（TB）的建筑物中 spp. 定植情况的调查。在所有建筑物中，均对热水和冷水样本中的 spp. 进行了计数。还评估了冷水的微生物饮用水标准。在 40%的建筑物中检测到了 spp.。此外，我们还发现了 spp. 计数与微生物生长的最佳温度（低于 40°C）之间的相关性。我们的结果表明，冷水没有微生物危害，但当平均冷水温度为 19.1 ± 2.2°C 时，检测到了 spp.。这可能接近 生长的亚最佳值（超过 20°C）。总之，我们观察到了存在军团病风险，需要采取一些策略来降低风险，例如对所有参与水系统维护的工作人员实施培训计划。
