[cnn-photo-caption image=http://www.cnn.com/2010/WORLD/americas/10/25/haiti.cholera/t1larg.haiti.hospital.cnn.jpg caption="Cholera outbreak kills more than 250 Haitians." width=300 height=169]
CNN Wire Staff
Editor's note: Actor-activist Sean Penn talks about the cholera outbreak and other problems affecting Haiti on CNN's "AC360°" at 10 p.m. ET Monday.
Port-Au-Prince, Haiti (CNN) - Calling Haiti's cholera outbreak "an extremely serious situation," a United Nations official expressed concern Monday that the infectious disease that has already killed more than 250 people could spread and grow to "tens of thousands of cases."
"It would be irresponsible to plan for anything but a considerably wider outbreak," said Nigel Fisher, U.N. humanitarian coordinator in Haiti.
Officials with the Pan American Health Organization expressed similar concerns about the disease spreading to the Domincan Republic.
"There is a very high risk that cholera will move to the other side of the island," said Dr. Jon K. Andrus, referring to the island of Hispaniola, which is shared by Haiti and the Dominican Republic. "There should be an island-wide approach on how to address cholera."
The Pan American organization had "expected these cases," said Andrus, and "put in an early-warning system to watch out for these consequences, since the earthquake on January 12."
Udpated: 6:15 p.m.
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