Ritu Sharma (right), shown during a visit to Honduras, makes one trip a year to live with underprivileged women, one week at a time, living as the women there live. Courtesy of Ritu Sharma hide caption

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A Pakistani man wheels Jamshid, an 8-year-old girl with polio, around the outskirts of the capital Islamabad last July. Behrouz Mehri/AFP/Getty Images hide caption

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The Anopheles stephensi mosquito transmits the malarial parasite while dining on human blood. You can find this type of mosquito in Afghanistan, China, India, Thailand and the Middle East. CDC hide caption

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A mother and child wait to receive treatment at the HIV clinic in Nyagasambu, Rwanda, in Feb. 2008. The clinic was built by the Washington-based Elizabeth Glaser Pediatric AIDS Foundation with a grant from the PEPFAR program. Shashank Bengali/MCT/Landov hide caption

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Local officials burn chicken coops in anticipation of a resurgence in bird flu in Jakarta, Indonesia, in January. Concerns about potential misuse of research into genes that control the contagiousness of flu have stymied publication. Tatan Syuflana/AP hide caption

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Here goes nothing. A big jump over the Zambezi River in Africa. James Whatley/Flickr hide caption

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Chickens were killed in Hong Kong last December in an effort to halt the spread of the deadly H5N1 strain of bird flu. Aaron Tam/AFP/Getty Images hide caption

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A competitor stops for a cigarette after he broke down during the Enduropale race at Le Touquet Beach on February 22, 2009 in Le Touquet, France. Paul Gilham/Getty Images hide caption

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U.S. Secretary of Health and Human Services Kathleen Sebelius (center) talks to a health worker during a visit to Eliazar Germain hospital in Port-au-Prince, Haiti, on Monday. It's Sebelius' first visit to the country. Ramon Espinosa/AP hide caption

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