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Know your chances

A common question people have is “What are my chances of getting an STI?”  While there is no simple answer, the charts below give an estimate of your chances, when your partner has that sexually transmitted infection (STI).

These charts are based on research where possible, and have been reviewed by STI experts in British Columbia.  These charts don’t cover every situation or STI.  For example, for HIV the charts do not address the fact that risk of transmission is even lower if your partner is on treatment for HIV and has undetectable viral load.

Here’s what the different chances mean in the chart:

  • Not passed (or possible only in theory): There is no possibility for passing the infection or it is theoretically possible, but there is no evidence that this happens.
  • Not commonly passed: This is not a common way to pass the infection but it may be possible with the right conditions (e.g., if condom breaks).
  • Can be passed:  The infection can be passed this way with the right conditions (for example, from skin which is not covered by a condom or barrier).
  • Easily passed: The infection is easily passed this way.

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STI, HIV, risk
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