Experts suggest that air conditioning cooling tower water is one of the important reasons for the spread of Legionella and the outbreak of Legionnaires' disease. It is recommended that the central air-conditioning unit adopt the following four preventive measures. First, the daily breeding of the main breeding grounds of Legionella, namely the central air conditioning system and the hot and cold water system, including regular cleaning of the air conditioning cooling towers and pipelines to ensure that the air conditioning system is clean and injecting water, avoiding the use of long-term storage water; The central air-conditioning system should regularly use Legionella-sensitive disinfectant bacteriostatic agents to ensure effective suppression of Legionella breeding and growth; 3. Regularly go to relevant health testing agencies for pathogen testing and hygienic evaluation of central air conditioning and hot and cold water systems. If the detection of Legionella is positive and the concentration exceeds the standard, effective disinfection measures should be taken immediately. 4. If Legionella patients are found, they should immediately report to the health department, conduct epidemiological and environmental investigations, and check the source of Legionella contamination.

According to experts, air-conditioning ventilation systems have become one of the main sources of indoor air pollution in buildings due to long-term operation and improper cleaning. Among them, Legionella easily multiplies and forms microbial aerosols in the cooling water of the air conditioning cooling tower, and some of them directly flow into the air around the cooling tower to infect pedestrians, and some of them are diffused by air conditioning to the infected room in the air-conditioned room. People. Infected people can produce Legionnaires' disease, which is an acute respiratory infection based on pneumonia. Once the epidemic is extremely harmful to the population, the mortality rate is as high as 5%-30%. The disease first occurred in a hotel in the United States, which caused a large-scale outbreak of a new type of respiratory infection. Most of the patients were veterans, so they were named Legionella. Since then, the disease has been found in several countries. After the first confirmed case of Legionella in Nanjing in 1982, China has paid more and more attention to Legionella contamination.