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| Investigation of Legionella contamination in artificial water environment of public places and identification of disease prototypes in Yantai City |
| ZHU Dongnan1 DONG Zhaojing1 WANG Songsong1 HOU Chunmei2 WANG Yanqing1 |
1.Department of Microbiology, Yantai Center for Disease Control and Prevention, Shandong Province, Yantai 264000, China;
2.Department of Laboratory, Zhaoyuan Center for Disease Control and Prevention, Shandong Province, Zhaoyuan 265400, China
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Abstract Objective To analyze the Legionella contamination in artificial water environment of public places in Yantai City Shandong Province, and identification of its pathogenic type. Methods A total of 150 samples of artificial water environment in public places in Yantai City, Shandong Province from January to December 2019 were selected as the research objects, and the detection rate of Legionella was statistically analyzed, and the types of Legionella detected were statistically compared. Meanwhile, the detection situation of Legionella in different water samples, places, total number of colonies, seasons and locations were analyzed and compared. Results Among 150 samples from artificial water environment in public places, 43 were detected with a detection rate of 28.67%, 40 were detected with single type, and 3 were detected with mixed type. The detection rate of Legionella haemophilus was significantly higher than that of non-haemophilus Legionella, and the proportion of Lp1 type was higher than that of other types, and the proportion of single type was higher than that of mixed condition, and the differences were statistically significant (P＜0.05). There was no statistical significance in the detection rate of Legionella in samples of different total colonies (P＞0.05), while the detection rate of Legionella in samples of air conditioning cooling water, medical units, summer, and suburban water were higher than those of other water samples, places and seasons, and the differences were statistically significant (P＜0.05). Conclusion In the artificial water environment of public places in Yantai City, Legionella contamination was prominent, with a high proportion of single types, and the detection rate of Legionella is relatively higher in air conditioning cooling water, medical units, summer, and suburban water samples, and there are great differences in the detection situation of different water samples, number of places and seasons, which can be used as a reference for formulating intervention and prevention and control measures.
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