The outbreak of the deadly Ebola virus in West Africa is an extraordinary event and a public health risk to other states, the World Health Organisation (WHO) said.
All states with Ebola transmission should declare a national emergency but international trade and travel should not be stopped because of the outbreak, the health body said.
WHO added that the possible consequences of a further international spread of the virus was "particularly serious" due to the virulence of Ebola.
As it reaches seven months since the Ebola outbreak started we take a look at the timeline of events leading up to the spread of the virus.
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