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bad experience overseas

Doc,

Thank you for your time.  I was in Hong kong last week on vacation and was very drunk.  I went home with a Thai girl that was i am pretty certain was a CSW that i met in a local bar.  We had unprotected vaginal and oral sex for over an hour.  Afterwards, she said that she was clean and was tested for HIV 2 months ago, was negative and had used condoms ever since.  My first question is what are my odds of catching HIV during this encounter.  My second question is that given it has been over a week, when should i get tested for STDs like gonorrhea, chlamydia or nongonococcal urethritis (NGU) and then Syphillis and HIV as I understand some STD test are not completely accurate until a certain timeframe.  Third, what are my odds of catching Syphillis give it is more prevelant in SE Asia and Thailand.  My final question is that I visited a doctor in HK and he prescribed Cefdinir 300mgs, 2x a day for 2 weeks to treat possible STDs like gonorrhea, chlamydia or nongonococcal urethritis (NGU) and he also indicated this could treat Syphilis.  After spending some time online, I am confused and not certain that will treat the above issues.  Could you please tell me what Cefdinir could treat of the above STDs?  Sorry in advance for all of the questions and i really appreciate your service as there is not a real easy place in the USA to go in order to get all of your questions answered.  Tx,    
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300980 tn?1194929400
MEDICAL PROFESSIONAL
As many as 1% of persons tested with the PCR  test can have false positives- this is more than 100 times to occur as for you to have HIV.  You'll have to ask a doctor where to get tested.

Most NGU is symptomatic.  If I were you, I would not bother to get tested unless you develop symptoms.

the risk of you getting gonorrhea or NGU is difficult to quantify as it is quite rare and therefore difficult to study.

Your STD is unlikely to be related to the sexual activity that you describe. When persons get oral STDs, they are usually asymptomatic.  EWH



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Avatar universal
Thanks doc, I promise this is my last post.

For HIV DNA testing what is the false positve rate and give my situation should i even do it?  On the 28th day, where should i go to get that type of test.  Further, for NGU, should i get tested or would that be something that the symptons would let me know if i had it as a swab sounds very painful.  Also, what are the odds of a male getting gonorrhea/NGU from a female orally and also, what are odds of male getting oral gonorrhea/NGU from giving a women oral sex?  The last question I asked as that i have a pretty bad sore throat.  I really appreciate the help and if I have any new questions i will pay another fee. tx
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300980 tn?1194929400
MEDICAL PROFESSIONAL
I answered the questions about testing for gonorrhea , chlamydia and NGU above.

DNA testing for HIV, if that is what you ean is not recommended becasue of false positves which are more common withthese tests.  If you choose to pursue DNA testing for HIV, a reuslt at 4 weeks should be conclusive but the sort of figures you mention above are just guesses, nothing more.  

NGU is best diagnosed with a swab specimen taken from the penis at least an hour after last urination. On occasion microscopic evaluation of urine collected just as a person begins to urinate can serve the same purpose but the swab is the preferred  approach.  With either method, one is not looking for bacteria but for white blood cells which are a sign of inflammation.  It is the signs of inflammation, manifest as increased numbers of white blood cells, which are the basis for the diagnosis of NGU.   EWH
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Avatar universal
on the NGU do i require a special test, or would a normal urine test from online test service pick it up under chlamydia?  tx a lot
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Avatar universal
if i want to ge tchecked for hiv, with the new dna tests and double tests on std express, when should i do it.  At 14 days i hear they are 60% acurrate, 95% at 21 days, and conclusive at 28  days.  Is that true.  Really appreciate your help.
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300980 tn?1194929400
MEDICAL PROFESSIONAL
Welcome to the Forum.  This was a rather low, but not no risk exposure.  I'll answer your questions one-by-one below:

1.  what are my odds of catching HIV during this encounter.

Very low.  the chance that your partner, even if she was a commercial sex worker, are low and the risk of getting HIV from a single episode of unprotected vaginal sex, if she was infected, are less than 1 in 1000.  There is virtually no risk of HIV from receipt of oral sex.

2.  given it has been over a week, when should i get tested for STDs like gonorrhea, chlamydia or nongonococcal urethritis (NGU) and then Syphillis and HIV as I understand some STD test are not completely accurate until a certain timeframe.

You can be tested at this time for gonorrhea, chlamydia and NGU and anticipate completely reliable results.  That you have no symptoms makes it unlikely that you are infected.  For syphilis, you would expect a sore to occur at a site of infection within 3 weeks of exposure and then for a blood test to be positive by about 4 weeks after the exposure.  If there is no sore that develops, the chance that the blood test would be positive is about zero.  Further, the antibiotic you took would prevent syphilis.  I would not worry about syphilis.  

3.  what are my odds of catching Syphillis give it is more prevelant in SE Asia and Thailand.

Low, syphilis is far, far less common than more common STDs like gonorrhea or chlamydia. Further, the cefdinir you mentioned would almost certainly prevent syphilis.

4.   Could you please tell me what Cefdinir could treat of the above STDs?

Cefdinir has not been well studied for STD treatment however it is in the class of antibiotics called cephalosporins which are well studied. The dose of cefdinir you mention would certainly prevent syphilis and probably prevent/cure gonorrhea although that is less certain.  it would not be expected to have any effect on chlamydia or NGU.

I hope these answers are helpful. Given your single exposure and the fact that you received the antibiotic you did, your risk for having acquired any STD from this event is close to zero.  I would not worry. EWH
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