The World Health Organization on Feb. 1 declared the Zika virus
outbreak to be a global public health emergency, citing a "strongly
suspected" relationship between Zika infection in pregnancy and
microcephaly.
Zika has not been proven to cause microcephaly in babies, but there
is growing evidence that suggests a link. The condition is defined
by unusually small heads that can result in developmental problems.
Brazil said it has confirmed more than 860 cases of microcephaly,
and considers most of them to be related to Zika infections in the
mothers. Brazil is investigating more than 4,200 additional
suspected cases of microcephaly.
(Reporting by Ju-min Park; Editing by Richard Pullin)
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