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Health officials in Colombia are warning that as many as 600 babies could be born with microcephaly this year.
With the second highest rate of Zika virus infections after Brazil, Colombia has more than 2,000 pregnant women showing symptoms.
Microcephaly is the condition in which babies are born with brains that are smaller than normal.
The Colombian authorities have watched events in Brazil.
They say they are determined to avoid another tragedy on the same scale.
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