They said a vaccine might be ready for testing in two years but it could be a decade before it is publicly available.
Zika, linked to shrunken brains in children, has caused panic across the Americas.
A baby affected with the Zika virus
Dr Vanessa Van Der Linden, from the Barao de Lucena Hospital in Recife, was the first person to spot a possible link between the Zika virus and a spike in the increase in microcephaly births, a dangerous condition where babies are born with abnormally small heads.
“I saw three cases of microcephaly in one day last August when normally I would see one maybe every three months,” she said.
“It was very strange.”
The Zika virus was discovered in monkeys in 1947 in Uganda’s Zika Forest, with the first human case registered in Nigeria in 1954 but for decades it did not appear to pose much of a threat to people and was largely ignored by the scientific community.
It was only with an outbreak on the Micronesian island of Yap in 2007 that some researchers began to realise that the virus could be dangerous to humans.
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There is no known cure for the virus
In rare cases the disease may also lead to complications including Guillain-Barre syndrome, a disorder of the nervous system which can cause paralysis.
The Zika virus is spread by the Aedes aegypti mosquito, which also carries dengue fever and yellow fever.
If a pregnant mothers is infected the baby will often be affected by microcephaly, which causes incurable brain damage.
Many people will not show any symptoms after being affected and there is no known cure. The only way to fight the virus is to protect against mosquito bites.
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