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Resistance testing has become an essential element of HIV care in settings with available resources. In two recent cohort studies, researchers examined the frequency of such testing and its effect on outcomes in HIV specialty clinics in the U.S. and the UK.
In the first study, researchers evaluated data from clinics participating in the U.S. HIV Outpatient Study (HOPS) to determine how often testing was performed in patients deemed eligible for it, based on viral load. Testing among such patients increased from 11% in 1999 to just over 30% in 2003 — and then remained above 30% through 2006 (the end of the study period). Around 2003, the rate of testing among treatment-naive patients began to exceed the rate among patients with treatment fail…