Why Didn't Zika Cause A Surge In Microcephaly In 2016?

A family member holds twins Eloisa (left) and Eloa, both 8 months old and born with microcephaly, during a Christmas gathering. The mother of the twins, Raquel, who lives in Brazil, said she contracted Zika during her pregnancy.  Mario Tama/Getty Images

CLICK HERE - NEJM - Zika Virus Infection and Associated Neurologic Disorders in Brazil

CLICK HERE - Science - Enhancement of Zika virus pathogenesis by preexisting antiflavivirus immunity

npr.org - by Michaeleen Doucleff - March 30, 2017

Back in 2015, Brazil reported a horrific a surge in birth defects. Thousands of babies were born with brain damage and abnormally small heads, a condition called microcephaly.

Scientists quickly concluded the Zika virus was the culprit. So when Zika returned last year during Brazil's summer months of December, January and February — when mosquitoes are most active — health officials expected another surge in microcephaly cases.

But that never happened.

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