World Health Organization declares Zika virus global health emergency

In May of last year, an outbreak of the Zika virus was discovered in Brazil.  Less than a year later, the virus has spread to over twenty countries in Latin America and the Caribbean, prompting the World Health Organization to declare it an international public health emergency in early February. An increasing body of evidence links the Zika virus, which is transmitted by mosquitoes, to microcephaly, a condition which causes babies to be born with unusually small heads and, consequently, inco...
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