HUMAN IMMUNODEFICIENCY VIRUS (HIV) HIV is a virus that attacks the immune system and gradually weakens the body’s ability to fight infections. If left untreated, it can lead to AIDS which is fatal. Symptoms: - HIV presents with flu like symptoms in early stages, followed by a long asymptomatic period. In later stages, there is: - Weight loss - Fever and fatigue - Recurrent infections - Co-morbid conditions like tuberculosis and Kaposi’s sarcoma.