More than 80 percent of the 40,000 new HIV infections each year are spread by people who didn’t know they had the virus or were diagnosed but never received treatment, according to the Centers for Disease Control and Prevention.

The data, provided Monday in the CDC’s Vital Signs report, sheds new light on HIV outbreaks at a time when the Trump administration has asked Congress to allocate $291 million in new funds next year to begin work that would halt new HIV transmission within a decade. The report indicates that the healthcare system will have to improve not just at identifying who has HIV, but at making sure people who are infected are consistently getting medical care.