A cross-sectional X-ray shows what's called a "sunken chest." The bright circle near the bottom is the spine; the gray blob on the right is the heart. Living LLC/Getty Images hide caption

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The pharmacy at Atlanta's Ponce de Leon Center stocks medications for 5,200 HIV/AIDS patients. Workers there aren't sure how much an increase in federal aid will help cut Georgia's waiting list for a HIV drug-assistance program. Jim Burress/WABE, Atlanta hide caption

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Ruben Bermudez stands in front of a sign that says in Spanish, "To love yourself is to protect yourself." He has struggled to remain eligible for AIDS drug assistance programs since he went on treatment four years ago. Jessica Camille Aguirre/NPR hide caption

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Senate Minority Leader Mitch McConnell says covering the uninsured shouldn't be Republicans' top health priority. J. Scott Applewhite/AP hide caption

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A mobile clinic set up to test students for HIV is parked near Madwaleni High School in Mtubatuba, KwaZulu-Natal, South Africa on March 8, 2011. Parts of the South African province have HIV rates that are more than twice the national average. Stephane de Sakutin/AFP/Getty Images hide caption

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A budget crunch in Oregon led to an unintended experiment that helped researchers assess Medicaid's effect on adults' health. iStockphoto.com hide caption

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Travelers crowd around a ticketing counter at John F. Kennedy International Airport in April 2010 in New York. Jason DeCrow/AP hide caption

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When the U.S. Supreme Court made a Medicaid expansion optional under the Affordable Care Act, the decision lowered the estimated cost of the law. Chip Somodevilla/Getty Images hide caption

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A heroin user keeps a syringe tucked behind his ear at a park in the city of Medan on Indonesia's Sumatra island. Cordita-Caritas Medan, a nongovernmental organization active there, works to reduce HIV infections through rehab of drug users and a needle exchange program. Sutanta Aditya/AFP/Getty Images hide caption

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