Abstract
PP-29-162 Background/Aims: To determine the prevalence of Legionella spp. in the cooling tower (CT) water in Chinese Jiangsu hotels and evaluated their potential effects on the exposed population. Methods: A total of 148 CTs were investigated and cultured for Legionella spp. Water samples (500 mL) from each CT was collected and measured the prevalence of Legionella. A total of 304 staffs worked in 2 hotels with only Legionella pneumophila serogroup 1 (L. pneumophila serogroup 1) contaminated CT and 270 staffs without exposure to CT were recruited, and their serum anti-L. pneumophila antibodies were examined, and a total of 200 urinal samples were collected for L. pneumophila serogroup 1 antigen. Results: The prevalence of Legionella in the CT water was 75%, and L. pneumophila group 1 counts for 85.6%. The serum prevalence of anti-L. pneumophila group 1 antibodies in the exposed population was not significantly higher than unexposed subjects (OR = 1.05, P = 0.865). No Legionella urinary antigen was detected. Conclusion: Working in L. pneumophila group 1 contaminated CT did not increased exposed risk to L. pneumophila. We should not pay too much attention to the role of the Legionella spp. polluted CT in the infection pathway of Legionnaires disease.
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