Brazil says the number of babies born with suspected microcephaly or abnormally small heads since October has now reached nearly 4,000.

Brazilian authorities believe the increase is caused by an outbreak of Zika virus.
ZIKA virus is spread by the Aedes aegypti mosquito,which also spreads Dengue and Chikungunya.Zika is generally mild and only causes symptoms in one in five people.

The brain condition can be deadly or cause intellectual disability and developmental delays and so women in Brazil have been advised to delay pregnancy.

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