Fatality rate
See also: Ebola virus disease § Prognosis
According to a website for collaborative analysis and discussion
about the Ebola emergence, as of 7 August, attempts to create an
accurate Case Fatality Rate (CFR) had been unreliable due to differences
in testing policies, the inclusion of probable and suspected cases, and
primarily the rate of new cases that have not run their course.[94]
However, on 28 August, the WHO made their first overall case fatality
rate estimate of 52%. It ranges from 42% in Sierra Leone to 66% in
Guinea.[95]
Compared to previous Zaire strain outbreaks, this number is quite low.
The twelve Zaire strain outbreaks since the first one reported in the
Democratic Republic of Congo in 1976 have had an average CFR of about
76%. Even the Sudan ebolavirus species, known to be less virulent than the Zaire species of the Ebola virus, has had an average CFR of about 57%.[96]
However, the WHO simply divided the number of deaths by the number of
total cases; this is error prone and can underestimate the CFR as it
includes new diagnoses who will not survive.[8]
A more accurate method that observed patient outcomes in Sierra Leone
found 23 survivors among 77 patients, giving a CFR of 77%.[9]end quote from:
No comments:
Post a Comment