What Are The Chances Of STD's Transmission Through Unprotected Sex?

Brief Answer:
Testing is advisable

Detailed Answer:
Hello and welcome to healthcaremagic

I am Dr. Kakkar. I have gone through your query.

1) Rapid HIV negative and RPR negative at 6 months after sexual act rules out HIV as well as syphilis since these tests were performed well past the window period of detection of HIV by ANTIBODY based test (which is 3 months) and incubation period of syphilis, respectively. Syphilis has an incubation period of an average of about 30 days and VDRL/RPR usually becomes positive within a week after chancre formation. As there is not even a history of Genital ulcer, and moreover the RPR was negative at 6 months, therefore you can forget about HIV and Syphilis from this particular encounter, except that you should have tested for Hep B as well.

Sexual route is not a common route for transmission of Hep C. HCV is mainly transmitted through parenteral exposures to contaminated blood e.g sharing needles etc in drug abusers. Therefore the risk for HCV is very less from sexual encounter and as far as HCV is concerned the odds are totally in your favor.

2)Regarding this particular exposure, although it was protected but there may have been some fluid exchange during wiping. Though it not a typical exposure route for transmission for an STD and the risks therefore are unknown but not Zero.

3)This particular exposure too even though for a very short duration (only for a second or so according to you, but may have been a longer exposure, if you were not aware exactly when did the condom broke) does pose some risks for an STD.

I would suggest testing for all STIs including HIV, RPR, HSV ELISA, Hep B at appropriate intervals from the most recent sexual exposure (3 days ago). Testing at appropriate intervals should be done. While HSV can be tested for at 2 weeks after the last sexual exposure, testing for HIV with a Combo test (antigen and antibody based test) should be earliest at 1 months with a repeat test at 3 months, if the first test is negative. RPR can tested at 1 month and the again after 3 months. You should also test for Hep B since all your exposure carries a risk for Hep B.

The chances of HIV are about 1 in 2500 after unprotected sex. Hep B is more infectious than HIV and the chances are 100 times more than what they are for HIV

Generally speaking, the longer the sex, and the more friction that occurs, the greater the chance for the microscopic tears to occur, and the greater the chance for the organism to enter into your body. Moreover, the longer the sex goes on, the greater the opportunity for the organism to enter your bloodstream and infect you. So the longer the sex continues, the greater the risk of infection. Since your unprotected sexual contacts have been very brief therefore the risks would be less but they cannot be dismissed as Zero, unless you test for them and confirm.

Regards

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Brief Answer:
Risk of STIs

Detailed Answer:
Hi.

We would have to consider each of these exposures as risky exposures because there was an unprotected component in each of these exposures, even though for a very short duration

The risk of acquiring HIV in terms of percentage is 0.3% for heterosexual contact. The risk with HBV is definitely more (as I said HBV is 50-100 times more infectious). The range that is quoted in studies is 18-40 % but it also depends on the infectiousness of the infected partner. In acute Hepatitis/infection the risk of transmission is more as compared to those who are in chronic stage or have been infected for more than 5 years in which the infectiousness falls to 6-10 %.

HCV as I mentioned before is close to null.

Regards

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