The RNA looks for the HIV virus itself,the DNA is a Viral Load test not used to diagnose HIV but rather to monitor people that already have the virus but it is used as a diagnostic test for infants born to HIV+ mothers.
Yes it is,this is only my opinion,if the DNA was positive then I believe there is not much doubt that the person has been exposed to HIV but if it's negativethen you can't say with 100% certainty that the person is indeed negative,where as the DUO test or Elisa antibody test would be more conclusive taken at the correct timeframes.
Most people will have extremely high viral loads in the early stages of infection so a false negative would be unlikely if you happened to be one of those people.The problem is that not all infected people will have a detectable viral load.
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