<prompt> Following is the marker of HIV infection in blood -Reverse TranscriptaseDNA polymeraseRNA polymeraseNone  <response>: Ans. is a, i.e., Reverse Transcriptase . Plasma level HIV R1VA can be measured by reverse - transcriptase polymerase chain reaction, -PCR or branched DNA assay b DNA . Other markers of HIV infection: p24 antigen - Double stranded DNA 