This statistic is based on a study in Brazil showing Zika-linked birth defects among infants born with microcephaly from August to October 2015. It was found that 71 percent of infant participants with microcephaly suffered from a significantly abnormal head circumference. Brazil had seen a sharp rise in cases of microcephaly among newborns in 2015 believed to be connected with the spreading of the Zika virus.
Zika-linked birth defects in Brazilian infants born with microcephaly between August and October 2015*
* Significantly abnormal head circumference defined as greater than three standard deviations away from the mean.
Abnormal head circumference defined as two to three standard deviations away from the mean.
All mothers lived in or had visited Zika-infected areas while pregnant.
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CDC. (January 29, 2016). Zika-linked birth defects in Brazilian infants born with microcephaly between August and October 2015* [Graph]. In Statista. Retrieved May 08, 2025, from https://www.statista.com/statistics/582024/infant-birth-defects-zika-linked-microcephaly-in-brazil/
CDC. "Zika-linked birth defects in Brazilian infants born with microcephaly between August and October 2015*." Chart. January 29, 2016. Statista. Accessed May 08, 2025. https://www.statista.com/statistics/582024/infant-birth-defects-zika-linked-microcephaly-in-brazil/
CDC. (2016). Zika-linked birth defects in Brazilian infants born with microcephaly between August and October 2015*. Statista. Statista Inc.. Accessed: May 08, 2025. https://www.statista.com/statistics/582024/infant-birth-defects-zika-linked-microcephaly-in-brazil/
CDC. "Zika-linked Birth Defects in Brazilian Infants Born with Microcephaly between August and October 2015*." Statista, Statista Inc., 29 Jan 2016, https://www.statista.com/statistics/582024/infant-birth-defects-zika-linked-microcephaly-in-brazil/
CDC, Zika-linked birth defects in Brazilian infants born with microcephaly between August and October 2015* Statista, https://www.statista.com/statistics/582024/infant-birth-defects-zika-linked-microcephaly-in-brazil/ (last visited May 08, 2025)
Zika-linked birth defects in Brazilian infants born with microcephaly between August and October 2015* [Graph], CDC, January 29, 2016. [Online]. Available: https://www.statista.com/statistics/582024/infant-birth-defects-zika-linked-microcephaly-in-brazil/