Weakly positive antibodies to Legionella pneumophila should be further examined to clarify whether it is a previous infection or in the infected stage before deciding on treatment measures. 1. Previous infection: It is necessary to check whether the IgM antibody is positive or the IgG antibody is positive. If it is simple, the IgG antibody is positive and the IgM antibody is negative, it means that it is a previous infection and the body has recovered, so there is no need to treat it at present. 2. In the period of infection: If the IgM antibody and IgG antibody are both positive, it means that the patient is in the period of infection, and may have fever, chest pain, cough, sputum and other symptoms. You can choose macrolide antibiotic treatment, such as azithromycin, roxithromycin, clarithromycin and so on, and at the same time with aminoglutethimide, bromhexine and other drugs to dilute sputum symptomatic treatment. It is recommended to go to the hospital for further examination, and follow the doctor’s instructions to decide on specific treatment measures, to avoid abusing drugs by yourself.