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HIV Transmission Guidelines for Assessing Risk

HIV Transmission: Factors that Affect Biological Risk

Copyright © 2013 Canadian AIDS Society / Société canadienne du sida

This document covers the most current scientific understandings of the factors that affect biological risk of HIV infection and transmission. There have been significant scientific advancements in understanding the biomedical aspects of HIV risk and prevention since the publication, HIV Transmission: Guidelines for Assessing Risk (Transmission Guidelines) was last updated in 2005.

This document primarily focuses on the risk of transmission through sexual contact. It summarizes the scientific evidence about the biomedical aspects of risk and transmission, without commenting on social or behavioural factors which are equally important but are beyond the scope of this document. Information about vertical transmission and risk due to drug use is covered in the Transmission Guidelines.


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For additional print copies of HIV Transmission: Factors that affect Biological Risk 2013, please contact CATIE’s Ordering Centre at: or by calling 1.800.263.1638.


HIV Transmission Guidelines for Assessing Risk: A Resource for Educators, Counsellors, and Health Care Providers - Fifth Edition.

Copyright © 2004 Canadian AIDS Society / Société canadienne du sida

The 5th edition of HIV Transmission: Guidelines for Assessing Risk marks a significant step forward in the evolution of the Canadian AIDS Society’s guidelines. For the first time, the revised guidelines incorporate hepatitis C (HCV) information and a section on assessing the risk of HCV infection. It
also contains information included in the last edition, such as that on injection drug use and maternal transmission.

As well, this edition retains the range of biological factors, including mucosal immunity, and HIV viral load, highlighting the complex factors that may increase or reduce an individual’s risk of infection.

HIV TRANSMISSION Guidelines for assessing risk.pdf

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HIV Transmission Guidelines for Assessing Risk. © Canadian AIDS Society. Published 07/27/2007. Updated 04/14/2014. Web. Retrieved 08/27/2016 from