PHOTO: United Nations
PHOTO: United Nations

Cholera, an infection of the intestines, has killed 2,500 people in Haiti, where an earthquake struck on January 12, 2010. A Cuban-led medical group of more than 900 doctors and nurses has set up 39 cholera treatment centers in the hardest-to-reach areas, where people are most vulnerable. It is the largest medical group in Haiti from any one country.