There are four main tests for pneumonia in infants: first, X-ray tests, which are involved in the diagnosis and determination of the disease. Second, pathogen tests, including pharyngeal swabs and blood culture tests, which are cultures of bacteria, and blood antigen and antibody tests, some of which can also detect antibodies from the urine, such as Legionella. Third, the examination of the disease, such as blood routine of white blood cells, C-reactive protein, calcitoninogen and arterial blood gas analysis. Fourth, there is no impact on other organs, such as heart tests such as cardiac ultrasound, cardiac enzymes, and liver function tests, and individual brain symptoms to do head CT or magnetic resonance imaging.