Zika virus infection during pregnancy is a cause of congenital brain abnormalities, including microcephaly (a condition where a baby is born with a small head or the head stops growing after birth, often associated with neurological defects); and that Zika virus is a trigger of Guillain-Barré syndrome (a rare condition in which a person’s immune system attacks the peripheral nerves which can result in temporary muscle weakness and loss of sensation in the legs and/or arms, occasionally causing life-threatening paralysis).