The mosquito-borne Zika virus may be even more dangerous than previously thought, scientists in Brazil said.
Zika continues to spread across the region. But the search for a vaccine is still in the early stages.
Rates of increase in Zika infection in some parts of Brazil have slowed, thanks to better information about preventing the disease.
Leading doctors have told the media that Zika could be behind more damaging neurological conditions, affecting one in five pregnant women who contract it.
