Amid concerns over an illness causing severe birth defects, officials in four Latin American and Caribbean nations have warned women to avoid pregnancy.

A BBC report has said, Colombia, Ecuador, El Salvador and Jamaica recommended to delay pregnancies until more was known about the mosquito-borne Zika virus.

This followed an outbreak in Brazil.

Brazil said the number of babies born with suspected microcephaly - or abnormally small heads - had reached nearly 4,000 since October.

Meanwhile, US health authorities have warned pregnant women to avoid travelling to more than 20 countries in the Americas and beyond, where Zika cases have been registered.

The link between microcephaly and Zika has not been confirmed - but a small number of babies who died had the virus in their brain and no other explanation for the surge in microcephaly has been suggested.

The virus normally has flu-like symptoms.