retrovirus
Examples of retrovirus in the following topics:
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Vaccines and Anti-Viral Drugs for Treatment- By far, the most successful use of antivirals has been in the treatment of the retrovirus HIV, which causes a disease that, if untreated, is usually fatal within 10–12 years after infection.
 
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Gene Duplications and Divergence- During cellular invasion by a replicating retroelement or retrovirus, viral proteins copy their genome by reverse transcribing RNA to DNA.