A method of treating a subject having or at risk for having a virus infection, by administering to the subject a therapeutically effective amount of a composition comprising a vector encoding a CRISPR-associated endonuclease and at least two guide RNAs, wherein the guide RNAs are complementary to two target sequences spanning from the 5′- to 3′-LTRs of the sequence in the virus, and completely resolving the symptoms of a disease, decreasing the severity of the symptoms of the disease, or slowing the diseases progression.
