Human immunodeficiency virus, or HIV, is the virus that causes AIDS. HIV weakens a person's ability to fight infections. It is mostly contracted through unprotected sex or needle sharing. Signs may include fever, headache, and swollen lymph nodes. An HIV test confirms diagnosis. Medications suppress the virus to help you stay healthy, prevent the spread of HIV, and delay or prevent the onset of AIDS. With treatment, HIV-positive persons can live normal, healthy lives
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disease