Drug-resistant HIV at levels too low to be detected by standard tests is not unusual and may contribute to treatment failure, according to research published in PLoS Medicine.

A mathematical model shows that a new wave of drug-resistant HIV is rising among among men in San Francisco who have sex with men and that this trend will continue over the next few years, according to a new study from the UCLA AIDS Institute.

A new drug is giving hope to patients with HIV who have become resistant to other treatments. Researchers including a team from Australia gave patients either an older HIV drug on its own or combined with a newer medication called darunavir.