无锡市冷却塔水军团菌污染状况及菌型分析

目的了解无锡市不同场所冷却塔水中军团菌污染状况和血清型别。方法按照无锡市地理分布抽取32家公共场所和8家工厂作为监测点,共抽取冷却塔水529份,按照卫生部《集中空调通风系统卫生规范》附录A"空调系统军团菌的检验分析方法"进行检测。结果 529份冷却塔水军团菌的检出率达14.18%(75/529),阳性率以商场和医院为高,分别为27.45%(14/51)和24.00%(18/75)。公共场所以7、8月份的阳性率为高,分别为18.75%(9/48)和25.25%(25/99);工厂工艺性冷却塔水军团菌在全年各月份均有检出。军团菌血清型以LP1为主,占78.67%(59/75)。结论无锡市不同场所冷却塔水中存在军团菌污染,对人群健康构成潜在威胁,需引起重视。

Contamination and serum type of Legionella in cooling tower water in Wuxi city

Objective To understand the contamination status and serum type of Legionella in cooling tower water from various places in Wuxi city. Methods Legionella was detected in cooling water from 32 public places and 8 factories in Wuxi from 2004 to 2009. There were total 529 samples. Legionella was tested according to "Central Air Conditioning Ventilation System Hygiene Norms of Public Health Appendix A". Results 75 samples were found Legionella among 529 samples. The total positive rate was 14.18% (75 / 529). The positive rates were the highest in hospital and market place cooling water, of 27.45% (14 / 51)and 24.00%(18 / 75), respectively. In public place the positive rates were highest in July and August, of 18.75% (9 / 48)and 25.25%(25 / 99), respectively. Meanwhile, Legionella was detected in all months in process cooling water in factory. The LP1 was the main type among all the LP, which accounted for 78.67% (59 / 75). Conclusion Legionella contamination of cooling tower water is serious in various places in Wuxi city. Some measures should be taken to improve the contamination status and prevent the outbreak of Legionnaires′ disease.