Some people in Havana were also taking precautions.
One man, a barber, said he was washing his hands more often, avoiding touching his mouth at work and boiling his drinking water.
Another, a street vendor, got rid of the cardboard box he had used to hold his sweet pastries, replacing it with a plastic one that's easier to keep clean and does a better job keeping the flies away.
"I, as a vendor, must protect and take care of others," Alfredo Bruceta said.
Associated Press journalists Franklin Reyes and Peter Orsi in Havana, and E. Eduardo Castillo in Mexico City, contributed to this report.
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