Low immunity is not necessarily AIDS. HIV is a very dangerous infectious disease caused by HIV virus. HIV virus attacks the immune system of the human body, causing the immune function of the body to decline, or even the loss of immune function, increasing the chance of the body to be infected with a variety of diseases, or even suffering from a variety of malignant tumors, with a high mortality rate. If you have high-risk behavior and suspect that you are infected with AIDS, you can go to your local medical institution for testing, or you can go to the local CDC for free testing, and the CDC can also do pre-test and post-test counseling.