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

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 (WHO) said Monday was a "strong" suspicion that the mosquito-borne virus is to blame for Brazil's big increase in the number of babies born with unusually small heads and damaged brains?

In a word: no. It's just too early to tell, experts say.

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