Legionella means Legionella bacteria, which are highly contagious and therefore require prompt anti-infective treatment and personal protective treatment after an attack. During the high season of Legionella or in an environment where Legionella is present, people are very susceptible to lung inflammation, chest pain, dyspnea, and other uncomfortable symptoms caused by Legionella infection. Since Legionella is mainly transmitted through the respiratory system, it spreads easily through the surrounding air and wind currents, and can easily cause widespread infection. If there is a possibility of Legionella infection in the surrounding environment, people need to do a good job of respiratory protection, and regularly clean the environment of the exhaust system or cooling water, etc., can effectively avoid the growth of Legionella. In the event of Legionella infection, close contact with others should be avoided and anti-infective treatment should be given. After Legionella infection or transmission, appropriate medication should be chosen under the guidance of a doctor for protection and treatment.