It would not replace naled, the pesticide sprayed from airplanes during the 2016 outbreak, angering Miami residents concerned the chemicals were more dangerous than Zika.

Health officials credited naled among other aggressive response efforts with stopping the outbreak.

But spraying naled or other poisons is a clunky, dangerous and ineffective solution to a persisting problem.

Naled is currently used in the United States by many local governments and mosquito control districts besides Miami, including the Florida Keys Mosquito Control District, the Lee County Mosquito Control District and Puerto Rico.

Approximately one million pounds of naled are used every year in the U.S.,