Contamination status of Legionella pneumophila in air-conditioning cooling and shower nozzles in some public places in Fengtai District,Beijing
Objective To understand the contamination status of Legionella pneumophila in air-conditioning cooling and shower nozzles in some public places in Fengtai District,Beijing.Methods A hygienic survey on Legionella pneumophila pollution in air-conditioning cooling and shower nozzles in some public places was carried out in Fengtai District from 2021 to 2023.The water samples were collected from cooling towers in accommodation places and hospitals,and from the shower nozzles in accommodation places,hospitals,bathing places and swimming places,and then Legionella pneumophila isolation and serotyping were conducted.Results A total of 240 water samples were collected from 116 public places in Fengtai District.The overall positive rate of Legionella pneumophila was 12.08％and the constituent ratio of LP1 was 55.17％(16/29).The positive rate in different types of public places was significantly different(P＜0.01)and the highest positive rate was in the residential places,21.25％.The positive rates of air-conditioning cooling and shower nozzles were 15.38％and 10.49％,respectively.No significant difference was seen in positive rates in different types of water.The positive rate in shower nozzles in different types of public places was significantly different,the highest positive rate was seen in the residential places,21.74％,and the lowest positive rate was seen in the hospitals,2.94％,with significant difference(P＜0.01).Conclusion The water from air-conditioning cooling and shower nozzles in public places in Fengtai District is commonly contaminated with Legionella pneumophila Hhealth supervision departments should strengthen the sanitary management of artificial water environment.The positive rate of showerhead water in the hospital is significantly lower than that in other places,suggesting that setting higher temperature of showerhead and periodic high-temperature flushing are effective means to control the Legionella pneumophila of shower system.
Public placeAir-conditioning coolingShower nozzlesLegionella pneumophilaLegionnaires'disease
NETL
NSTL
万方数据
