Human Immunodeficiency Virus (HIV) Infection

What Increases Your Risk

Most people get HIV by having unprotected sex with someone who has HIV. Another common way of getting the virus is by sharing needles with someone who is infected with HIV when injecting drugs.

You have an increased risk of becoming infected with HIV through sexual contact if you:

  • Have unprotected sex (do not use condoms).
  • Have multiple sex partners.
  • Are a man who has sex with other men.
  • Have high-risk partner(s) (partner has multiple sex partners, is a man who has sex with other men, or injects drugs).
  • Have or have recently had a sexually transmitted infection, such as syphilis or active herpes.

People who inject drugs or steroids, especially if they share needles, syringes, cookers, or other equipment used to inject drugs, are at risk of being infected with HIV.

Babies who are born to mothers who are infected with HIV are also at risk of infection.

What to think about

HIV may be spread more easily in the early stage of infection, when the first flu-like symptoms of HIV (acute retroviral syndrome) are present, and again later, when symptoms of HIV-related illness develop.

The risk of getting HIV from a blood transfusion or organ transplant is extremely low because all donated blood and organs in Canada and the United States are screened for HIV.


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Author: Douglas Dana
Maria G. Essig, MS, ELS
Last Updated: October 10, 2007
Medical Review: Adam Husney, MD - Family Medicine
Anne C. Poinier, MD - Internal Medicine
W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
Peter Shalit, MD, PhD - Internal Medicine

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