Zika virus: tests support links to birth defects and paralysis

'Everything we know about this virus seems to be scarier than we initially thought,' say officials

US health experts have confirmed that the Zika virus is the cause of severe birth defects, including microcephaly.

The condition, which causes children to have abnormally small heads, affected hundreds of babies born in Latin America last year, the rise in cases mimicking a spike in the number of people being infected by the Zika virus in the area.

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