Last week, Edmond Mulet, head of the UN mission in Haiti, said no UN soldier, police officer nor civilian official had tested positive for cholera, and he defended the Nepalese, who have been the target of protests.
All samples taken from the latrines, kitchens and water supply at the suspect Nepalese camp have proved negative, Mulet said.
"There is no scientific evidence that the camp at Mirebalais is the source of this epidemic," he said, complaining of "a lot of disinformation, a lot of rumours around this situation."
But Piarroux -- who works at the University of the Mediterranean in Marseille -- told AFP that the outbreak was not linked to the earthquake devastation, and could not have come from a Haitian environmental source.
"The epidemic exploded in an extremely violent way on October 19, with several thousand cases and several hundreds deaths after many people drank the water of the Artibonite delta," he said.
The professor said the world had not seen cholera spread so quickly since an outbreak in Goma, in eastern Congo, in 1994. "We've had more than 70,000 cases, and we could easily see them hit 200,000," he warned.
"But there won't be tens of thousands of deaths, nor a sudden spike."
Cholera is caused by bacteria spread in contaminated water or food, often through faeces. If untreated, it can kill within a day through dehydration, with the old and the young the most vulnerable.
Source-AFP