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More countries confirm discovery of Zika virus cases

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.

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Zika virus may infect up to 4 million in the Americas

The Zika virus may infect 3-4 million people in the Americas, including 1.5 million in Brazil, the World Health Organisation has said.

The mosquito-borne Zika virus, which is thought to cause defects in newborn babies, is now "spreading explosively", the body said.

people in Brazil are thought to have been infected by the virus

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