Efforts to reach fewer than 500 000 new HIV infections by 2020 are off track. This simple conclusion sits atop a complex and diverse global tapestry. Data from 146 countries show that some have achieved declines in new HIV infections among adults of 50% or more over the last 10 years, while many others have not made measurable progress, and yet others have experienced worrying increases in new HIV infections. More on the Prevention Gap report | Slides are also available for download | Download summary