Et længerevarende virologisk respons er ligeledes observeret i et mindre fase II studie (M97- 720) efter 360 ugers behandling med Kaletra (i kombination med nukleosid/ nukleotid revers transkriptasehæmmere).
Sustained virological response to Kaletra (in combination with nucleoside/ nucleotide reverse transcriptase inhibitors) has been also observed in a small Phase II study (M97-720) through 360 weeks of treatment.