Legionnaires’ disease is not usually transmitted from person to person. Legionnaires’ disease is a bacterial infection caused by a respiratory infection by the Legionella bacteria, the causative agent of which comes mainly from contaminated water sources and invades the body from the respiratory tract. Legionella bacteria are mainly infected by multiplying in the stagnant waterways of pipes and streams, and are inhaled through aerosols formed by spraying or plumbing fixtures. So there is usually no human-to-human transmission. Most patients with Legionella infection will show asymptomatic or very mild symptoms of a transient infection, while a few patients may develop pneumonia and other symptoms such as fever, chills, nausea, vomiting, diarrhea, and other non-specific symptoms. At present, the treatment mostly uses levofloxacin tablets, bromhexine hydrochloride tablets, azithromycin tablets and other drugs. In daily life, we should avoid living in a humid and unventilated environment, keep the shower water clean, air conditioning regularly clean, pay attention to nutritional light diet, pay attention to replenish water, if there are uncomfortable symptoms during the recovery period, it is recommended to consult a doctor in a timely manner.