Resistance mutations found at first ARV switch (VL arm).

This table shows 18 patients randomized to the VL arm who reached switching criteria of >400 copies/ml. The last samples collected before switch were genotyped. One participant with extensive PI resistance in the pretreatment specimen is omitted from this table.a“Duration of replication before genotype” is defined as time from first detection of VL >400 copies/ml to genotyping. This may be shorter than the duration before ARV drug switching.bThese two participants were not included in calculations related to ARV drug switches since, although they met VL criteria for switching during the study, they both switched after the end of the study (April 1, 2010).