Two different patterns of mutations are involved in the genotypic resistance score for atazanavir boosted versus unboosted by ritonavir in multiple failing patients

Santoro, Mm; Bertoli, A; Lorenzini, P; Ceccherini Silberstein, F; Gianotti, N; Mussini, C; Torti, Carlo; Di Perri, G; Barbarini, G; Bini, T; Melzi, S; Caramello, P; Maserati, Renato; Narciso, P; Micheli, V; Antinori, A; Perno, Cf; CARe Study, Group