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New versions of coronavirus that spread faster and might evade the immune system are causing fears about vaccine efficacy and a rise in covid-19 deaths. Here鈥檚 what you need to know
A retrovirus is a type of virus that uses RNA as its genetic material, rather than DNA. Upon infecting a cell, it uses an enzyme called reverse transcriptase to create a DNA copy of its RNA, which it inserts into the genome of its host.