Florida, the first state to report the arrival of Zika in the continental United States, has yet to invite a dedicated team of the federal government's disease hunters to assist with the investigation, health officials say.

Coordination with the U.S. Centers for Disease Control and Prevention since the state reported possible local Zika transmission on July 19 has been conducted largely at a distance, they said. That is surprising to some experts on infectious diseases, who say a less robust response could lead to a higher number of infections.

While Florida has a strong record of battling limited outbreaks of similar mosquito-borne viruses, including dengue and chikungunya, the risk of birth defects caused by Zika adds greater urgency to containing its spread with every available means, they say. Other states have quickly called in CDC teams to help track high-profile diseases.