Whose responsibility is it to stop Zika? The largely mosquito-borne1 virus has spread to more than 20 countries and territories in the Americas since it arrived in Brazil about a year ago, and there’s concern that it’s threatening the fetuses of pregnant women

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Is the Zika virus an international health emergency? That is the question a committee of health experts convened by the World Health Organization will answer on Monday. If they decide that it is, that would mobilize funds for research and escalate efforts to fight the virus, which is exploding in Latin America

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