Sylvester Jusu is a volunteer who works with the Red Cross burial team in Sierra Leone. Tommy Trenchard for NPR hide caption
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AIDS drugs line a pharmacy's shelves. A new recommendation from the World Health Organization suggests a daily anti-HIV pill for men who have sex with men. Astrid Riecken/MCT/Landov hide caption
On the outskirts of Islamabad, a Pakistani health worker vaccinates an Afghan refugee against polio. Muhammed Muheisen/AP hide caption
Testing for Ebola, a scientist in a mobile lab at Gueckedou, Guinea, separates blood cells from plasma cells to isolate the virus's genetic sequence. Misha Hussain/Reuters /Landov hide caption
Many people like these Tibetans in Qinghai, China, rely on indoor stoves for heating and cooking. That causes serious health problems. Courtesy of One Earth Designs hide caption
Pepper is the spice most commonly contaminated with salmonella and other pathogens. iStockphoto.com hide caption
A child is immunized against polio at the health clinic in a farming village in northern Nigeria. The procedure involves pinching two drops of the vaccine into the child's mouth. For full protection, the child needs three doses, spaced out over time. David Gilkey/NPR hide caption
An Indian boy receives a polio vaccination from an Indian health worker in Amritsar last year. Narinder Nanu/AFP/Getty Images hide caption
A woman, left, cuts the hair of a fellow tuberculosis patient at a clinic in the township of Khayelitsha, on the outskirts of Cape Town, South Africa, in March.
Schalk van Zuydam/AP hide caption
A street scene in New York City on Tuesday (May 31, 2011). Spencer Platt/Getty Images hide caption