Types of STIs

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There are more than 20 known types* of sexually transmitted infections (STIs.) Chlamydia and gonorrhea are the most common STIs in Canada, especially in teenagers and young adults.**

All STIs have one thing in common: they are spread through sexual contact, including vaginal, anal and oral sex.

This section offers information about the most common STIs - for example the signs and symptoms and treatment. Visit our HIV/AIDS section for specific information about HIV/AIDS, including what to do if you're HIV positive and HIV and pregnant.

Types of STIs

-- Sources --
*  The University of Chicago Hospitals
** The Public Healthy Agency of Canada

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