Hello, I had a sex encounter with a prostitute and i used protection. After three months I went to the clinic for hiv combi test and its negative. My preoccupation it's that the results is very near to the Index level, Result 0.22 index level = ≥ 0.25. I need to take the test again?, this result imply any risk of been developing the disease?. I hope you can respond my questions.