Pcr Dna versus Rna
Oct 13, 2013
I want to know what is the difference between Pcr dna vs rna and which one is more effective? ALSO I had a PCR DNA with an antibodies hiv test at 39 days after a sexual encounter and got negative results, is that conclusive enough?
Response from Dr. Wohl
HIV uses RNA as its genetic code. We use DNA. To get int our cell and use it to make more HIV, the virus has to convert its RNA to DNA and then get that DNA integrated into our genes.
So, HIV RNA test are helpful in that they look for virus that is circulating. The DNA tests look for DNA the virus has made after entering a cell.
For diagnostic purposes and monitoring infection the RNA test is used. Absence of RNA and antibodies several weeks after exposure indicates no infection.
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