Confirmation of the Culprit: Zika

Confirming an association between congenital Zika virus and a spike in microcephaly cases in Brazilian babies in 2015, a new study published in The Lancet points to an absence of evidence to support other theories that cropped up.

The Brazilian scientists found no link between microcephaly and the insecticide pyriproxyfen, added to Brazilian drinking water in 2014 to control disease-carryingAedes aegypti mosquitoes; nor was there a link between microcephaly and maternal vaccination during pregnancy.

Researchers uncovered an “extremely strong” link between microcephaly and Zika infection during pregnancy—but more research would help uncover why so few infected women gave birth to severely infected infants.


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