Multiple choice Which of the following techniques is utilised in detecting viral nucleic acids? ELISA Dot blot assays Western blot Viral isolation Polymerase chain reaction (PCR) Reveal answer Fill a bubble to check yourself E Correct answer Explanation In case of HIV infection this test finds either the RNA of the HIV virus or the HIV DNA in white blood cells infected with the virus. The PCR test is very useful to find a very recent infection.