Scientists are still unsure of the exact origin of Haiti's cholera strain. Lawrence Livermore National Laboratory hide caption
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Thursday
Two trucks crashed on a road toward Saint-Marc in Haiti. One truck was carrying Coke bottles, the other was full of people. The head-on collision knocked the bed off the back of one truck, killing several and injuring many more. Christopher Joyce/NPR hide caption
People distribute potable water near a tent city in Port-au-Prince. Officials say a vaccine would do little to prevent more cases of cholera there. Thony Belizaire/AFP hide caption
Wednesday
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
Monday
Artibonite Lake in Haiti has been infected with cholera after 50 years without a single case in the country. Thony Belizaire/AFP/Getty Images hide caption
A health care worker washes her hands in clean water before leaving St. Nicolas Hospital in St. Marc, north of Port-au-Prince on October 24, 2010. THONY BELIZAIRE/AFP hide caption
Friday
Cholera victims in Haiti receive treatment at the St. Nicholas hospital in Saint Marc, Haiti. Dieu Nalio Chery/AP hide caption
Scientists hope a soy-based, curry-flavored snack food will appeal to malnourished Indian kids. Courtesy of Dr. Soo-Yeun Lee hide caption
Wednesday
Jorge Galleguillos, the 11th miner rescued from the San Jose mine, is carried away on a stretcher after being trapped underground with 32 other miners. Hugo Infante/Government of Chile/AP hide caption
Wednesday
On April 29, 1975, as Saigon was falling to Communist North Vietnamese forces, a small U.S. Navy destroyer escort ship, the USS Kirk, played a dramatic but almost forgotten role in rescuing up to 30,000 South Vietnamese. Here, a member of the USS Kirk's crew tends to a Vietnamese baby. Hugh Doyle hide caption
Thursday
Villagers displaced from their homes walk through flood waters on August 24, 2010, near Muzaffargarh in Punjab, Pakistan. Daniel Berehulak/Getty Images hide caption
Monday
The Ebola virus causes a hemorrhagic fever that is usually deadly. Frederick Murphy/CDC hide caption