Plenty of viruses use DNA and not RNA. The virus injects it's DNA sequence into the host DNA.
This is why people have "flare ups" of herpes/cold sores. That is a DNA virus, so once the cells are infected they carry that DNA sequence forever, even after the cells divide.
This is why people have "flare ups" of herpes/cold sores. That is a DNA virus, so once the cells are infected they carry that DNA sequence forever, even after the cells divide.