Officials in Miami are trying to calm fears about the Zika virus.
They're stepping up efforts to try stop the mosquitoes that carry the virus.
Spraying from the air to try to stop the Zika virus began early in the Miami area.
"The mosquitoes in the traps all died which means it was effective," said Mayor Carlos Gimenez, Miami-Dade.
The target, the Aedes aegypti mosquito that's proved tough to get rid of.
Centers for Disease Control and Prevention Director Tom Frieden met Thursday with local officials to talk about the plan of attack.
"I'm very impressed with how intensive the control activities are. They have over a hundred teams in the field. They are going to ensure that people hear the key messages which is get rid of anywhere this mosquito can breed," said Dr. Tom Frieden, CDC director.
Efforts to fight mosquitoes on the ground are also being ramped up, but health officials acknowledge the aggressive spraying isn't working as well as they hoped.
The Wynwood section of Miami is considered ground zero for health officials. At least 15 cases of locally transmitted Zika have been reported in South Florida.
So far, 2,300 people have been tested for Zika across Florida, including 200 people in the Zika zone. The governor of Florida visited local business, trying to reassure residents and tourists.
"We're telling everyone, this is a safe state. We have one square mile that we think might have locally transmitted Zika. We're not seeing new cases. People should come to our state," said Gov. Rick Scott, R-Florida.
Pregnant women are at greatest risk because the virus can cause devastating birth defects. Earlier this week, the CDC advised pregnant women to avoid the Wynwood area.
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