Countries including South Africa and Trinidad and Tobago have confirmed their first cases of Zika virus.
More than 5,000 pregnant women in Colombia have contracted the virus, its government has said.
A 61-year-old woman has been confirmed as the first Zika case in Trinidad and Tobago, the country's health ministry said.
Thousands of people across central and south America have already contracted the virus including many pregnant women.
The mosquito-borne disease has been linked to microcephaly in babies, an abnormal smallness of the head.
Britain's camp for the Rio Olympics should be moved to a Zika-free location outside Brazil, Jessica Ennis-Hill's coach has said.
The mother of Zika "bucket baby" Jose Ferreira is holding out hope despite doctors' fears over his future.
The government has told airlines to take the measure on all flights travelling to the UK from countries with confirmed transmission of Zika.