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Dear Doctor,

first the all, I'm sorry for my English.

Two weeks ago I had had something like food poisoning (chills, 39C, diarrhea, sweating, dizziness, tiredness) I did all blood tests include HIV. The result is: HIV 1/2 - negative; Combo test - reactive. I did combo test again, and after one week got the result - non reactive.

Tell my please, is it Combo test true? Which one is true - first or second?
Best regards


Hi there, and thanks a lot for contacting the AIDS Vancouver Helpline for you HIV/AIDS related health information.

It sounds like you are concerned about the reliability of your test results.

I understand that you had something like food poisoning and had some blood tests done. You say that your first test came back reactive and your second test was non-reactive. You did not give me any information for me to base a risk assessment on, therefore I cannot tell you your risk of HIV transmission.

I also cannot tell you which test is accurate since I was not there and do not know that complete situation.

Based on this, the following is my recommendation:

  • All HIV tests are considered consider to be conclusive 3 months post exposure to HIV. I would recommend that you take another a test in 3 months. The result that you get from that test will be considered conclusive.

I would encourage you to check out the following resources about HIV:

Thank you for contacting the AIDS Vancouver Helpline.


AIDS Vancouver Helpline/Online