The chief of the World Health Organization says the group will hold an emergency meeting about the Zika virus, which has been linked to birth defects and neurological problems.

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Brazilian officials still say they believe there’s a sharp increase in cases of microcephaly and strongly suspect the Zika virus, which first appeared in the country last year, is to blame. The concern is strong enough that the U.S. Centers for Disease Control and Prevention this month warned pregnant women to reconsider visits to areas where Zika is present.