How deadly is Ebola? Statistical challenges may be inflating survival rate

The Ebola virus that is causing the raging epidemic in West Africa is famously lethal. In previous outbreaks it has killed as many as 90% of the people it infects. That’s why the figures in World Health Organization’s (WHO’s) latest “Situation Report” look like they might be a rare glimmer of good news. Although the rate of infections is picking up speed at an alarming rate, the report says the fatality rate is 53% overall, ranging from 64% in Guinea to just 39% in Sierra Leone.

But there’s a catch: The apparent low proportion of deaths probably depends more on the way health officials are calculating the number than on the deadliness of the virus—or the quality of care patients are receiving. Indeed, the dramatic increase in cases in recent weeks is one of the main reasons the reported death rate appears to be artificially low.

To read the whole article please go to:

http://news.sciencemag.org/africa/2014/09/how-deadly-ebola-statistical-challenges-may-be-inflating-survival-rate

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