Question | Discussion | References | CME Credit  Case 2:
Features of Genotypic and Phenotypic Resistance Assays  You
answered:  D When a patient is undergoing a change in
antiretroviral therapy because of virologic failure, genotypic
resistance testing does not provide any benefit in improving
virologic responses.  This answer is incorrect. Several clinical
trials have demonstrated that genotypic resistance testing
improves virologic response among patients undergoing salvage
antiretroviral therapy, primarily among patients that have
experienced virologic failure to a single or a few regimens.
Fewer trials have been conducted regarding phenotypic testing,
and the results to date have been equivocal. Attention to the
patient's antiretroviral history and the experience of the
clinician in using resistance data have also been found to
impact on the suppressive effect of the prescribed salvage
regimen.  Choose another answer:  A Compared with the phenotypic
assay, the genotypic assay is more expensive and has a l