When it comes to the spiraling global coronavirus outbreak, scientists are still trying to pin down the answer to a basic question: How deadly is this virus?
Estimates have varied widely. For instance, at a Feb. 24 news conference in Beijing, a top Chinese health official, Liang Wannian, said the fatality rate for COVID-19 was quite high.
"Between 3 to 4% of patients have died," said Liang.