The largest and longest in history.
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The World Health Organization on Friday declared the Ebola outbreak in West Africa to be an international public health emergency that requires an extraordinary response to stop its spread.
The WHO announced the Ebola outbreak — the largest and longest in history — is worrying enough to merit being declared an international health emergency. WHO declared similar emergencies for the swine flu pandemic in 2009 and for polio in May.
This agency had convened an expert committee this week to assess the severity of the ongoing epidemic.