PREVIEW
In the field of HIV medicine, the term “salvage regimen” refers to one that is constructed for a patient in whom multiple previous regimens have been unsuccessful, for a wide variety of reasons. Although such regimens may have unproved efficacy, they are based on some solid scientific data or principles. In this article, the authors discuss the current state of genotyping and phenotyping used for resistance testing, the challenges involved in interpreting the data they provide, and factors to keep in mind when considering a switch to a different treatment regimen.