‘Ebola mortality rate expected to rise’
Experts have said they expect the death rate in the world’s worst outbreak of Ebola to increase once more victims succumb and the grim data is tallied up.
Latest figures from the World Health Organization (WHO) reveal 1,603 cases of Ebola in the West African outbreak and 887 deaths – giving a death rate of just over 55 percent.
That is well below the 78.5 percent average death rate over 14 past outbreaks of the same virus – called the “Zaire strain” after the former name of the Democratic Republic of Congo where it was first detected in 1976, Reuters says.
In some outbreaks the rate was up to 90 percent, according to WHO data.
Experts said death rates for Ebola outbreaks can rise as the disease runs its course, which is what they now expect.
“This is partly a statistical thing about collecting death events, and also partly about the maturity of the outbreak,” said Derek Gatherer, a virologist at Britain’s University of Lancaster who has been following the outbreak since it started in February.
“The nearer we get to the end of the epidemic, the closer we would expect the fatality rate to correspond to the Zaire Ebola average of 80 percent,” he told Reuters.
Ebola can take up to a month to kill its victims, said Ben Neuman, an expert in viruses at Britain’s Reading University.
Already, the death rate in Guinea, where the infection was first detected, has reached 74 percent. The overall regional outbreak mortality figure is brought down by lower death rates in countries that were more recently hit: 54 percent in Liberia and around 42 percent in Sierra Leone.