wafaa el-sadr oversees icap-- which also supports global hiv prevention and treatment programs. says testing as many people as possible, and treating them as quickly as possible, is one of the best tools for ending the epidemic. >> getting those individuals into care, on treatment, for their own benefit as well as of course to prevent transmission from them to others. that's something we have to tackle. and that's usually individuals who are disenfranchised, afraid, in denial, stigmatized, so it's a hard to reach population that we must reach. >> brangham: new york has also pioneered other, data-driven ways to find people in need of hiv care. using medicaid information, the state works in tandem with specialized insurance companies like "amida care" to identify patients who've stopped having tests or stopped refilling prescriptions for their hiv meds. outreach workers then try to get them back into treatment. right now in new york, medicaid covers half the hiv-positive people in the state, so keeping those people in care is crucial. one estimate said nearly $4 billion could be s