Thank you for your inquiry. From what we gather from the question, you were asking about the risk of acquiring HIV after engaging in protected vaginal sex. From the information given, this scenario is determined to be Low Risk (evidence of transmission occurs through these activities when certain conditions are met).
The scenario mentioned above could meet the three components of the transmission equation. Using a condom during sex is a fantastic way of lowering your risk of acquiring HIV and other STIs, but there is still risk involved due to improper use or potential breakage of the condom.
It was very responsible of you to access testing after engaging in a risky activity. The rapid finger prick test you received is a 3rd Generation test that detects HIV antibodies (1). An HIV antibody test done 4 weeks after an exposure will detect up to 95% of infections, indicating that it is very unlikely for your next test to be positive. It is important to note that these tests are considered completely conclusive 3 months post-exposure, in which over 99% of infections will be accurately detected.
In regards to your concerns about the public facial clipper, as long as it is not used by someone right before you who is profusely bleeding and you do not use it on any large wounds, there is no risk of HIV transmission. A relatively short period of exposure to oxygen will render the virus inactive.
Recommendation: Refer to a health care provider for HIV testing 3 months post-exposure for completely conclusive results.
AIDS Vancouver Helpline/Online, Marie
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1) HIV Testing Technologies