Legionnaires’ disease is contagious. Legionnaires’ disease, or Legionella pneumonia, is mainly due to gram-negative pneumophilic Legionella bacteria caused by a contagious disease, which tends to enter the lungs through airborne transmission, and gram-negative pneumophilic Legionella bacteria after entering the lungs, often cause coughing, coughing up sputum, fever, headache, respiratory distress and other symptoms. Legionnaires’ disease, once diagnosed, should be actively taken treatment, mainly anti-infective treatment, commonly used drugs such as erythromycin, azithromycin, etc., some patients may need to add rifampicin for treatment, the condition is more serious, can be taken to intravenous infusion treatment. Legionnaires’ disease medication must be guided by a doctor, the patient can not be arbitrary use of drugs.