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How severe is the Zika virus outbreak?
The World Health Organization estimates that 4 million people could be infected by the Zika virus in 2016. NBC News' Dr. Natalie Azar joins the discussion.
World News on msnbc
Fmr. United Nations Secretary-General Kofi Annan dies at age 8000:32
Mother describes anguish of being separated from children at border03:11
Death toll of Italy bridge collapse expected to rise dramatically02:58
Dozens of children killed in school bus bombing in Yemen02:04
As US and EU back away from trade war, some charts08:14
Iraq vet, Rep. Moulton, criticizes Trump's Twitter threats11:56