Haitian Cholera Epidemic Continues to Kill Elsewhere

Cholera bacteria — The bacteria that cause cholera shown under a microscope. (Image credit: CDC/ Janice Carr)

GAINESVILLE, Fla. — Since a cholera epidemic began in Haiti in 2010, the disease has killed more than 8,300 people in that country. The bacteria that cause cholera may be settling in for good in Haiti, and meanwhile, its swath of destruction appears to be widening to other countries, researchers reported here Sunday (Nov. 3).

United Nations Peacekeepers from Nepal stationed in Haiti appear to have introduced the strain of the bacterium responsible for the epidemic through untreated sewage from their camp. This strain has since begun infecting and killing people in the Dominican Republic, Cuba and most recently, Mexico, health organizations report. Advocates for Haitian cholera victims have said they will sue the United Nations to force the international organization to admit responsibility for the epidemic, The New York Times reported.

The cholera bacterium, Vibrio cholera, lives in water, particularly in estuaries or slightly salty aquatic environments. Under the right conditions, such as warm temperatures, these bacteria multiply and infect people who use the water. [7 Devastating Infectious Diseases]

It appears that this strain of cholera may be staying in Haiti permanently, Morris said.

"What we find is the bacteria does appear to be taking up residence within the environment," he said. "That means what we are seeing is not a one-shot thing, but something that will keep happening."

Historical records indicate cholera has been with humans for at least a millennium. The strains circulating now likely originated from a bacterium in Asia's Bay of Bengal region in the 1950s. Since then, the pathogens spread out in three waves, according to research reported in the journal Nature in 2011.

"In many ways, it's a simple disease," Morris said. Cholera causes severe diarrhea, which leads to dangerous dehydration and potentially death. But it is easy to treat. A fluid mixture containing salt and sugar is used to replace 1.5 times the volume of diarrhea, he said.

On Oct. 28, the World Health Organization reported 176 confirmed cases of cholera, including one death in Mexico caused by the strain from Haiti. In Cuba, the Pan American Health Organization has reported 678 confirmed cholera cases, including three deaths, and authorities in the Dominican Republic have reported 31,021 confirmed cases, including 456 deaths.

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Wynne was a reporter at The Stamford Advocate. She has interned at Discover magazine and has freelanced for The New York Times and Scientific American's web site. She has a masters in journalism from Columbia University and a bachelor's degree in biology from the University of Utah.