There was an average decrease in susceptibility of 2-fold wild type (WT) for tipranavir, 12-fold WT for amprenavir, 55-fold WT for atazanavir, 41-fold WT for indinavir, 87-fold WT for lopinavir, 41- fold WT for nelfinavir, 195-fold WT for ritonavir, and 20-fold WT for saquinavir.