Why isn’t Zika causing birth defects in Colombia? It may only be a matter of time.

BOGOTA -- No country outside Brazil has confirmed more Zika cases than Colombia — including more than 2,100 pregnant women who have had the virus. But so far health officials have not found a single case of the birth defect known as microcephaly among those expectant mothers. Is that a reason to doubt what the World Health Organization […]











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