See below: You can get tested anytime. If the result is positive, it is definitive. If the exposure was less than one year ago, you will need to be retested. At three months after exposure you could get an HIV nucleic acid and if that is negative, it would rule out HIV. See this site for more info. http://www.cdc.gov/hiv/guidelines/index.html
Answered 2/3/2018
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