Loss of genotypic activity.

<p>Loss of genotypic activity among patients treated with non-nucleoside reverse transcriptase inhibitors (NNRTIs) or ritonavir-boosted protease inhibitors (PI/r). A) Loss of activity of 1 NRTI (open bar section) or >1 NRTIs (hatched bar section). B) Loss of activity of a NNRTI or PI/r. 95% confidence intervals are indicated. *** Fisher exact p<0.001, ** p<0.01.</p>