The storm has already killed 66 people in the Caribbean, where it battered Haiti and Cuba. In Haiti, a top U.N. relief official warned of a heightened risk of a new outbreak of waterborne disease.

Johan Peleman: “So, the entire southern peninsula, including the province, the county where Port-au-Prince is, had been — has been very heavily affected with flooding. Rivers have burst out of their banks, the canals running through Port-au-Prince, because Port-au-Prince lies in a valley surrounded by hills. What we fear most is that there might be spikes in waterborne diseases, especially cholera, which we always see after flooding or rains in Haiti.”