In a new report, the Centers for Disease Control and Prevention on Monday highlighted the gaps in access to treatment and testing resources that exists within the HIV care continuum. Those gaps have led to a halt in recent years to the progress made over the past two decades in reducing HIV infections.

An estimated 15% of people with HIV don’t know they have the virus, and that population accounted for 38% of all new infection, according to the study. Those who know their HIV status but are not receiving care make up 20% of people living with the virus but account for 43% of new infections.

CDC Director Dr. Robert Redfield said the epidemic could end over the next few years by expanding access to testing and consistent treatment.