Hygienic status of centralized air conditioning and ventilation systems in public places in Yantai City during the SARS-CoV-2 infection epidemic period of 2020-2021
YU Gui-mei, LI Yun, YU Tao, WANG Song-song, CONG Jing, YU Shu-tao, CHEN Fu-xun, YAN Xi-ge
Yantai Municipal Center for Disease Control and Prevention, Yantai, Shandong 264003, China
Abstract:Objective To monitor and evaluate the sanitary status of centralized air conditioning and ventilation systems in public places in Yantai City during the SARS-CoV-2 infection epidemic from 2020 to 2021. Methods In 2020-2021, 116 public places with centralized air conditioning and ventilation systems were monitored, and the test items included the total number of bacteria, the total number of fungi and Streptococcus hemolyticus in blowing air of centralized air conditioners, the total number of bacteria, the total number of fungi and SARS-CoV-2 on the inner surface of air ducts, and Legionella pneumophila in cooling water and condensed water. Results The qualified rates of testing of centralized air conditioning and ventilation systems in public places in 2020 and 2021 were 39.0% (30/77) and 56.4% (22/39), respectively, showing no statistically significant difference (χ2=3.187, P=0.074). There were significantly differences in the qualified rates of different places (χ2=11.86, P<0.05), among which the qualified rate of shopping malls was the highest (65.0%), but the qualified rates of entertainment places (0.0%) and hospitals (33.3%) were low. Streptococcus hemolyticus and SARS-CoV-2 were not detected in the samples collected from blowing air and the inner surface of air ducts. The qualified rate of the total number of bacteria in blowing air of centralized air conditioners was relatively high (98.2%), but the qualified rates of the total number of bacteria (65.5%) and the total number of fungi (71.6%) on the inner surface of air ducts were relatively low. Conclusion It is necessary to strengthen the supervision of cleaning and disinfection of centralized air conditioning and ventilation systems in public places so as to eliminate the hidden sanitary and safety hazards of centralized air conditioners.
于桂梅, 李芸, 于涛, 王松松, 丛静, 于树涛, 陈富讯, 阎西革. 2020—2021年新冠感染疫情期间烟台市公共场所集中空调通风系统卫生状况调查[J]. 实用预防医学, 2023, 30(3): 287-290.
YU Gui-mei, LI Yun, YU Tao, WANG Song-song, CONG Jing, YU Shu-tao, CHEN Fu-xun, YAN Xi-ge. Hygienic status of centralized air conditioning and ventilation systems in public places in Yantai City during the SARS-CoV-2 infection epidemic period of 2020-2021. , 2023, 30(3): 287-290.
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