Anonymous
Hi,
I had a risky exposure with a sex worker more than 3 months back.
My antibody HIV test done at 90th day post exposure came out negative.
I was advised to get a Hepatitis B test done because of my high risk exposure.
I got a HBSAg test done by the Chemiluminsence method after 110 days of exposure and the report read non-reactive with a reading of 0.05
1) Does Hepatitis C and Hepatitis B infection (be it chronic or acute) affect the window period of 3 months (12 weeks, 90 days) of HIV testing. I have heard that co-infection of HIV and HCV effects the window period of 12 weeks of HIV.
2) Is HBSAg a standard test for detection of Hepatatis B infection and what is the window period for it?
3) Also how common is it for HCV / HBV to pass through sexual exposure and do I need to test for HCV?
Please note I haven't had any exposure post the one mentioned in the first line.
I will greatly be obliged and grateful to you if you answer this.
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Anonymous
Hi there and thanks for using the AIDS Vancouver online helpline as your source of HIV/AIDS related information.
1. While undergoing treatment of HCV (Hep C) and/or HBV (Hepb) (if antiviral medication is used), HIV test results may be affected, however infection with hepatitis B/C (without antiviral therapy) would not affect your test results. If you are undergoing antiviral treatment, then testing beyond 3 months may be indicated. 2. HBSAg testing is a standard test for the detection of hepatitis B infection. Your negative result at 110 days post exposure is strongly suggestive that you do not have an HBV infection. In regards to a window period, the literature varies however according to a physician at the BCCDC it can take up to 80 days for HBSAg to be detectable. 3. HCV is transmitted through direct contact with contaminated blood (blood to blood). As such there is a very low risk of HCV transmission through sexual contact. HBV can be transmitted through sexual contact, in addition to blood-blood contact. Exact probabilities for transmission via sexual contact/ blood-blood contact are unknown. I hope this helped to answer your questions and please do not hesitate to ask if you have any further questions.
Cheers, Jonathan
Helpline Volunteer helpline@aidsvancouver.org
604.696.4666 (Mon-Fri 9am-4pm PST)
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