Legionella pneumophila antibodies are antibodies produced by the human immune system against Legionella pneumophila. Legionella pneumophila is a common bacterium that can cause pneumonia and other respiratory infections. After infection with Legionella pneumophila, the immune system produces antibodies to fight the virus, and these antibodies protect the body from infection with Legionella pneumophila.

The Legionella pneumophila antibody test can be used to diagnose Legionella pneumophila infection and monitor the effectiveness of vaccination. Common Legionella pneumophila antibody tests include enzyme-linked immunosorbent assay (ELISA) and neutralization test. By measuring the level of Legionella pneumophila antibodies in the serum, it is possible to determine whether the person has been infected with Legionella pneumophila or whether the corresponding vaccine has been received. If the antibody level is high, it indicates that the human body has strong immunity and can effectively resist Legionella pneumophila infection. If the antibody level is low, the body has weak immunity and is vulnerable to the threat of Legionella pneumophila infection.