Tenofovir, an analog of adenosine monophosphate, is a nucleoside reverse transcriptase inhibitor used to treat HIV infection. Atazanavir, also used to treat HIV infection, is a protease inhibitor. Approximately 1 in 1,000 virus particles carries a mutation that confers resistance against any given anti-HIV drug. If there are 1010 virus particles circulating in a patient, roughly how many of them would be resistant to both tenofovir and atazanavir?   - 104   - 106   - 107   - 5 x 107   - 1010

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