HIV compromises the immune system, leading to AIDS. Early HIV symptoms include fever and swollen glands. Late stage AIDS symptoms include weight loss, fatigue, and infections. HIV is transmitted through contact with infected bodily fluids like during unprotected sex or sharing needles. Prevention methods include condoms, needle exchange programs, and avoiding contact with infected fluids. Currently over 33 million people have HIV/AIDS globally, with most cases in sub-Saharan Africa.