Result: Of the 38 major and minor
integrase inhibitor resistance associated codons, 44, 61, 66, 92, 121, 140, 143, 147, 148, 155, 226 and 263 were the only positions absolutely conserved across all 342 sequences and these included six primary resistance-associated mutations for raltegravir and elvitegravir (
T66I,
E92Q,
G140S,
Y143C/H/R Q148H/R/K and
N155S/H).
Discussion: In this population-based review of all sites associated with
integrase inhibitor resistance in 342 natural isolates of HIV-1 obtained from two geographically distinct cohorts in Switzerland an