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Infectious Diseases

Human Immunodeficiency Virus (HIV)

Government of Canada - Human Immunodeficiency Virus (HIV)

Simcoe Muskoka District Health Unit - Human Immunodeficiency Virus (HIV)

HIV infection is caused by a virus that attacks the immune system and destroys cells that fight off other infections and diseases. AIDS is the most severe phase of HIV infection. HIV is a manageable chronic condition. With treatment, people living with HIV can have long and healthy lives. However, if left untreated, it can cause a weakened immune system or acquired immune deficiency syndrome (AIDS). (PHO, 2025).