WHO: Months Needed to Establish Link Between Zika, Microcephaly

Evidence is piling up of a causal link between the Zika virus and both microcephaly and Guillain-Barre syndrome, according to the World Health Organization. WHO reports show that more than 40 countries in four of the WHO's six regions have recorded Zika virus infections while only two places — Brazil and French Polynesia — have shown an increase in microcephaly cases.  The situation is particularly serious in Brazil, which has recorded more than 4,700 cases of babies born with...

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