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In Brazil an increase in cases of infants born with microcephaly (small head) has been noted coincident with the Zika epidemic, and the virus has been recovered from amniotic fluid and from fetal tissue, suggesting that Zika infection during pregnancy may cause microcephaly in the developing fetus. An increase in cases of Guillain-Barre syndrome has also been observed during this and previous outbreaks. Studies are underway to determine if Zika virus is the cause of microcephaly and Guillain-Barre syndrome.

In Brazil an increase in cases of infants born with microcephaly (small head) has been noted coincident with the Zika epidemic, and the virus has been recovered from amniotic fluid and from fetal tissue, suggesting that Zika infection during pregnancy may cause microcephaly in the developing fetus. An increase in cases of Guillain-Barre syndrome has also been observed during this and previous outbreaks. Studies are underway to determine if Zika virus is the cause of microcephaly and Guillain-Barre syndrome.