RT Journal Article SR Electronic T1 The unprecedented scale of the West African Ebola virus disease outbreak is due to environmental and sociological factors, not special attributes of the currently circulating strain of the virus JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 28 OP 28 DO 10.1136/ebmed-2014-110127 VO 20 IS 1 A1 Derek Gatherer YR 2015 UL http://ebm.bmj.com/content/20/1/28.abstract AB