(CBC News) Large numbers of babies with borderline normal head sizes were born in Brazil as far back as 2012, two years before the Zika virus is thought to have entered the country, say researchers searching for answers to urgent questions.
Pediatric cardiologist Dr. Sandra Mattos had been collecting data on 100,000 newborns in the Brazilian state of Paraiba as part of her work studying and treating congenital heart disease.
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The microcephaly fears linked to the Zika virus drove her team to check back into hospital records for head circumferences of more than 1,600 babies born in the state in the last four years.