Researchers at the U.S. Geological Survey National Wildlife Health Center in Madison, Wis., use eggs to see if the Asian strain of the H5N1 bird flu virus has entered the U.S. in this photo from 2006.
Mosquitoes like this one can carry the virus that causes dengue fever, which may become a bigger problem in some regions as biodiversity is lost.
James Gathany/CDC Public Health Image Library
A health official culls chickens on a poultry farm in a village on the outskirts of Katmandu, Nepal. Chickens suspected of being infected with H5N1 bird flu were found in the area in October.
Prakash Mathema/AFP/Getty Images
Rukhsana Bibi (center) mourns for her daughter, polio worker Madiha Bibi, killed by unknown gunmen, at a local hospital in Karachi on Tuesday. Gunmen staged additional attacks Wednesday.
In rural areas of Myanmar, villagers can buy inexpensive packets of drugs, called Ya Chut, when they have malaria. But these local remedies often don't contain adequate amounts of malaria medicines.
Ben de la Cruz/NPR
Massachusetts Gov. Deval Patrick says uncertainty about a federal budget deal in Washington played a big part in his recent announcement of cuts to his state's budget by $500 million.
An employee tidies boxes of medicines displayed in a pharmacy in the city of Caen in western France last month. Beginning in 2013, girls between the ages of 15 and 18 will be able to get birth control free of charge, and without parental notification.
Charly Triballeau/AFP/Getty Images
A prefectural officer carries a chicken on a poultry farm on Oct. 15 on the outskirts of Kathmandu, Nepal, where chickens suspected of being infected with bird flu were found.
Prakash Mathema /AFP/Getty Images
A boy in Lima, Peru, receives a hepatitis B vaccine during an immunization drive in 2008. The United Nations is considering a ban on the preservative thimerosal, which is often used in hepatitis B and other vaccines in developing countries.
Average life expectancy around the world has ticked up over the past twenty years. Here it's shown for men in 2009. The extremes are in dark green and dark red, which represent 78 to 82 years old and less than 66 years old, respectively.
Courtesy of the Institute for Health Metrics and Evaluation