Since Human Immunodeficiency Virus (HIV) testing, Syphilis testing, hepatitis B testing and other virus testing is not necessary for the patients at a hospital if they are not treated by operation, the doctors won’t know whether the patients are infected by HIV, when inpatients with AIDS and their relatives conceal their condition because of social prejudice, making the reported death rate lower than the actual one. Here, PPIB is linked to hepatitis A virus infection.