[Question #6113] Antibiotic confusion

19 months ago
Hi Drs, I wrote you about a month ago but I had a question on testing. I had strep throat and was prescribed amoxicillin 2 days after exposure. I then was still sick and 16 days after finishing the ten days of amoxicillin I was given a high dosage of penicillin. So it’s been 32 days since the event.  So I did have 16 days of not taking antibiotics. Would testing for trich, clamidya
, and gohnaria Be accurate now or would the medications mess up the tests.  Spell check is not working. The encounter was protected Vaginal and protected oral.  Again this was 32 days ago. I tried looking up the answer but cannot find an answer.

Thanks for your time
H. Hunter Handsfield, MD
H. Hunter Handsfield, MD
19 months ago
Welcome back to the forum, but sorry you found it necessary. I reviewed your discussions with both me and Dr. Hook a month ago and can reaffirm all the advice you were given then. Dr. Hook really answered your current question at that time. In addition, there was essentially no risk of any of these infections anyway, given condom protected vaginal and oral sex.

Antibiotics do not "mess up" testing for STDs except by curing them. In other words, there is no risk of being infected but having negative test results because of antibiotics. Negative testing for gonorrhea, chlamydia, and trichomonas will be 100% proof you are not infected at the time of testing. 

HHH, MD
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19 months ago
Thanks, my question was based on reply’s from other questions where you stated to wait a week after antibiotics. Does this not apply to me because a month has passed and that is enough time? 
19 months ago
In other words, my test was done 28 days post exposure and was negative but I had been taking antibiotics, it’s pribably anxiety. Just making sure it was enough time. Got nervous when you wrote to wait a week after taking them but that may be for infections that take place sooner than 28 days. Sorry for the question but thankful you provide accurate info. 
19 months ago
Last question, would getting hep a vaccine interfere with hiv test? I am supposed to get it prior to my 6 week test. I am now done, my apologies
H. Hunter Handsfield, MD
H. Hunter Handsfield, MD
19 months ago
I understood the timing. Indeed, more than a week after finishing the antibiotic, your blood test was conclusive. There are NO medications, drug treatments, or illnesses that interfere with the modern, standard HIV tests. That includes any vaccines. It's an urban myth, left over from concerns about the earliest HIV antibody tests, which have not been in use for 20+ years.---
19 months ago
I had everything tested except Trich. If I get that test now would the penicillin I am currently taking affect that test. Thanks so much, your response cleared everything else up 
H. Hunter Handsfield, MD
H. Hunter Handsfield, MD
19 months ago
Trichomonas testing is not recommended in men in the absence of known contact with a trich infected female partner, or in the event of nongonococcal urethritis (NGU) that doesn't respond to standard treatment. In any case, trich is unaffected by any antibiotic you were given. The negative result is conclusive.

That concludes this thread. Please note that the forum does not permit repeated questions on the same topic, so this will have to be your last on these issues. Thanks for your understanding. I hope the two discussion have been helpful. Best wishes and stay safe.
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