Objective　To analyze the changes in wastewater disinfection quality and influencing factors of medical institutions in Nanjing from 2020 to 2024, providing a reference for infection control departments in medical institutions regarding wastewater monitoring and management. Methods　A total of 28 medical institutions in Nanjing were selected as the survey subjects. Microbial and total residual chlorine tests were conducted on hospital wastewater samples from 2020 to 2024 to compare the changes in the qualified rate of wastewater disinfection over the past five years. A current status investigation was also carried out on wastewater disinfection management, wastewater discharge, wastewater treatment equipment, and wastewater online monitoring systems in these hospitals. Results　From 2020 to 2024, 140 samples of hospital wastewater were collected. Over the past five years, the disinfection quality of hospital wastewater showed a downward trend, with statistically significant differences (χ²trend=6.986, P<0.05). The qualified rate for microbial indicators was 82.14% (115/140), while the on-site qualified rate for the total residual chlorine test in 2024 was only 56.52%. Among the 28 surveyed medical institutions, 85.71% (24/28) outsourced disinfection work to third-party companies, while 14.29% (4/28) carried out disinfection by institutional staff, with no statistically significant difference (χ2=0.200, P>0.05) in the qualified rate of disinfection. Sodium hypochlorite was used to disinfect wastewater in 82.14%(23/28) of the institutions, while other disinfection methods included chlorine dioxide (7.14%, 2/28), potassium monopersulfate (7.14%, 2/28), and ozone (3.57%, 1/28). A statistically significant difference in disinfection qualification rates was observed between sodium hypochlorite and chlorine dioxide (χ2=6.802, P<0.05). Additionally, wastewater online monitoring systems had been installed in 25 institutions, but 16.00% (4/25) of them had yet to achieve full project monitoring coverage. Conclusion　From 2020 to 2024, the quality of wastewater disinfection in medical institutions in Nanjing has declined, highlighting an urgent need to enhance wastewater monitoring. This would help reduce the impact of pathogenic microorganisms and other pollutants from hospital wastewater on the living environment.

Objective: To analyze the disinfection quality and influencing factors of nurseries in Nanjing during 2019-2021, so as to provide a scientific basis for optimizing preventive disinfection strategies and measures in nurseries. Methods: Environmental samples from 389 nurseries in Nanjing from January 2019 to December 2021 were tested, and the change of disinfection quality qualification rate was compared. Results: The overall disinfection qualification rate of nurseries of year 2019-2021 were 96.32%, 95.85% and 94.60%, respectively, showing a downward trend ( χ 2 trend =8.67, P <0.05). Specifically, disinfection qualification rate of object surfaces, staff hands and tableware showed a downward trend, while the disinfection qualification rate of dynamic air showed an upward trend, and the differences were statistically significant ( χ 2 trend =23.17, 12.32, 5.37, 21.48, P <0.05). The total qualification rate of disinfection in Jiangning and Liuhe districts increased during 2019-2021( χ 2 trend =21.46, 24.05, P <0.05). Conclusion Disinfection quality of nurseries in Nanjing has declined by year during 2019-2021, especially the object surfaces and staff hands. It is urgent to optimize and refine the strategies and measures for preventive disinfection in nurseries, strengthen the training of personnel on disinfection knowledge, and ensure the quality of disinfection in nurseries.