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/ bws48,
Make sure you take this document in its full context. Note that the 42 days without an ebola case in a region is the WHO criteria for declaring
an outbreak is over.
For monitoring
individual people, the WHO still recommends a 21 day period. From the same WHO document you link, see the following:
According to WHO recommendations, health care workers who have attended patients or cleaned their rooms should be considered as “close contacts” and monitored for 21 days after the last exposure, even if their contact with a patient occurred when they were fully protected by wearing personal protective equipment.
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