With health authorities warning the disease could infect up to four million people in the Americas, ministers from 14 countries held talks in Uruguay to plot their response to the growing crisis, with fears the virus could spread worldwide.
The meeting focused on ways to control the mosquito population spreading the virus, though reports of a US patient catching the disease by having sex fueled fears that it will not be easy to contain.
Brazil said it was sending more than 500,000 personnel out to clean up mosquito breeding grounds and advise people about the disease.
Brazilian President Dilma Rousseff said her government was directing "all resources" available toward the crisis, and vowed to do "absolutely everything" for the families of babies born with microcephaly, or abnormally small heads and brains.
The number of babies with the condition has surged since the Zika outbreak sweeping Latin America was detected last year.
"This virus, which only recently arrived in Brazil and Latin America, no longer is a distant nightmare but a real threat to all Brazilians' homes," Rousseff said in a nationally televised message.
Florida Governor Rick Scott meanwhile declared a health emergency in four counties after six new Zika cases were detected in the US state.
The new infections bring the number of Zika cases in Florida to nine.
Authorities say all caught the virus while traveling abroad, though there is concern it could spread locally because the Aedes aegypti mosquito that transmits the virus is present in the southern United States.
The fever starts with a mosquito bite and normally causes little more than a fever and rash.
But since October, Brazil has reported 404 confirmed cases of microcephaly -- up from 147 in 2014 -- plus 3,670 suspected cases.
The timing has fueled strong suspicions that Zika is causing the birth defect.
The virus has also been linked to a potentially paralyzing nerve disorder called Guillain-Barre syndrome in some patients.
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