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PCR ACCURACY

Question: 

Hi! I would like to know the accuracy of a PCR did 13 days after the risk situation (scratches in penis not covered by condom). I got the results now and it's ok, that is, negative (<50). But could I trust in this results after only 13 days?
I have an extra question: two days ago a fingered a sexworker vagina and after that I realized I had a peeled finger which was not bleeding. This new situation can be considered a risk situation for HIV and others STD's?
Please, I need your help!!
 

Answer: 

Hi there,
Thank-you for using AIDS Vancouver Helpline Online.
The RNA PCR test and the DNA PCR test has a window period of 2-3 weeks post exposure, therefore your negative result post 13 days is a good indication of your status. Even though you only mentioned you had a PCR test, just wanted to inform you that there are 2 different types, the RNA PCR and DNA PCR. The only difference between these 2 tests is that the DNA PCR is usually used for screening babies of HIV+ mothers, and the RNA PCR is used to screen blood or organ donations.
According to governmental guidelines, a test is conclusive at 3 months therefore even though it is unlikely that your status will change, I would recommend an antibody test at 3 months for conclusive and definite results. Also, it may be helpful to know there has never been a documented or reported case of HIV transmission from scratches on the penis but perhaps could be a risk for other sexually transmitted infections. Condoms are still the most effective way to prevent HIV transmission because if the condom does not break or fail in some way, transmission of HIV is not possible.
To answer your second question, fingering is considered a negligible risk and there has never been a confirmed report of transmission of HIV in this manner. There is a possibility of contracting other sexually transmitted infections (STIs) such as gonorrhea as it is possible to contract it by putting your finger into the vagina, therefore I would recommend you get tested for any STIs. In addition, it is good to remember that people (such as sex workers) are not high risk but some activities (such as unprotected sex) are!
If you have any more questions feel free to email or comment on this post.
Have a good day,
Kamani
AIDS Vancouver Helpline Volunteer
604.696.4666, Monday-Friday 9am-4pm PST
helpline@aidsvancouver.org
 

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