According to the data you provided (positive elisa test, inconclusive western blot, PCR less than 20 copies/ml after six months of exposure), it cannot be determined for sure whether you have been infected with HIV.
HIV viral load tests are reported as the number of HIV copies in a milliliter (copies/mL) of blood. If the viral load measurement is high, it indicates that HIV is reproducing and that the disease will likely progress faster than if the viral load is low. Initial, untreated, and uncontrolled HIV viral loads can range as high as one million or more copies/mL. A low viral load is usually between 40 to 500 copies/mL, depending on the type of test used. This result indicates that HIV is not actively reproducing and that the risk of disease progression is low.
In your case, seroconversion was already expected to occur, if any. The viral load of 20 copies/ml is considered low, but you are advised to take the test again.
You might want to visit a specialist for infective diseases for additional tests and examination to check whether you are infected with HIV or not.
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