Virus
Reverse transcribing viruses Reverse transcribing viruses with RNA genomes (retroviruses) use a DNA intermediate to replicate. Those with DNA genomes (pararetroviruses) use an RNA intermediate during genome replication. They are susceptible to antiviral drugs that inhibit the reverse transcriptase enzyme. An example of the first type is HIV, which is a retrovirus. Examples of the second type are the Hepadnaviridae, which includes Hepatitis B virus.88/9