Rio de Janeiro has declared a public health emergency because of an outbreak of mosquito-borne dengue fever, the city said in its official gazette on Monday, just days before Carnival celebrations kick off across Brazil.

But the outbreak wasn’t expected to disrupt Carnival, which officially starts on Friday evening and runs until Feb. 14.

Rio city hall announced the opening of 10 care centers, the creation of an emergency operations center and the allocation of hospital beds for dengue patients. Authorities will also use “smoke cars” in regions with the highest incidence of cases, diffusing an insecticide in the air.