Originally Posted By: Arney
Originally Posted By: James_Van_Artsdalen
PS. Does the number 21 actually have any scientific standing?

The 21 days is the longest observed incubation period for Ebola. There have not been that many cases of Ebola before this current outbreak, so that number may change as more cases appear and more data is collected.


From the WHO:

"Recent studies conducted in West Africa have demonstrated that 95% of confirmed cases have an incubation period in the range of 1 to 21 days; 98% have an incubation period that falls within the 1 to 42 day interval. WHO is therefore confident that detection of no new cases, with active surveillance in place, throughout this 42-day period means that an Ebola outbreak is indeed over."

http://www.who.int/mediacentre/news/ebola/14-october-2014/en/
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