An emergency meeting of the World Health Organization is being held to discuss the “explosive” spread of the Zika virus.
The meeting in Geneva will decide whether to declare a global emergency.
WHO officials have described Zika as moving “from a mild threat to one of alarming proportions”.
Most cases will have no symptoms but the virus has been linked to brain abnormalities in thousands of babies in Brazil.
Meanwhile in the country, officials have been given permission to break into properties that could be harbouring mosquito breeding grounds.
They will be able to force entry when the place is abandoned or when nobody is there to give access to the house.