The mosquitoes spreading Zika in Miami are proving harder to eradicate than expected, the nation's top disease-fighter said Tuesday as authorities sprayed clouds of insecticide in the ground-zero neighborhood, emptied kiddie pools and handed out cans of insect repellent to the homeless.
Dr. Tom Frieden, director of the Centers for Disease Control and Prevention, said the mosquito-control efforts in the bustling urban neighborhood aren't achieving the hoped-for results, suggesting the pests are resistant to the insecticides or are still finding standing water in which to breed.
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