The microcal vaccine is mainly an inactivated vaccine that has some immune adjuvant effect, stimulating the TH1 immune response in the body and not stimulating the body’s T-lymphocytes. The vaccine can also improve the body’s immunity to a certain extent, so that the body can produce protective antibodies to prevent disease, but the microcal vaccine can have certain side effects, which may cause fever in the injected person. In addition, the vaccine can also be used to prevent tuberculosis infection and other diseases.