People who test positive for infection with bacteria that cause tuberculosis can be treated before they enter the U.S. Janice Haney Carr/CDC hide caption
Joe Neel Joe Neel is NPR's deputy senior supervising editor and a correspondent on the Science Desk.
Outsiders might be unfamiliar with the U.K.'s National Health Service, but Brits love it so much that they devoted part of opening ceremonies at the 2012 London Olympics to the NHS. Courtesy of BBC One hide caption
Sir Elton John speaks Monday at the 19th International AIDS Conference in Washington. Carolyn Kaster/AP hide caption
Service members model the Modified Service Dress Blue Sweater. The Commissioned Corps of the U.S. Public Health Service requires that members wear either the sweater or a windbreaker. Commissioned Corps of The U.S. Public Health Service hide caption
Service members model the Modified Service Dress Blue Sweater. The Commissioned Corps of the U.S. Public Health Service requires that members wear either the sweater or a windbreaker. Commissioned Corps of The U.S. Public Health Service hide caption
Dr. G. Michael Lemole, Jr., left, looks on as Dr. Peter Rhee talks about the condition of U.S. Rep. Gabrielle Giffords (D-AZ), at University Medical Center during a news conference in Tucson, Ariz., Monday, Jan. 10, 2011. Matt York/AP hide caption
Sick cholera victims and families wait at St. Nicolas Hospital in Saint-Marc, north of Port-au-Prince. Saint-Marc residents burned down nearby tents Wednesday that were supposed to relieve pressure on the hospital. Thony Belizaire/AFP/Getty Images hide caption