[Resistance to anti-retroviral therapy in Chilean patients with HIV-1 from 2002 to 2005].

Background: Resistance limits the effectiveness of anti-retroviral therapy. In Chile, there is free access to highly active anti-retroviral therapy since 2001, but there is no information about the frequency of mutations associated to drug resistance.

Aim: To determine the most common mutations associated to anti-retroviral drug resistance in Chile.