On Thursday, after the World Health Organization held a two-day online meeting of 1,300 scientists from around the world, the agency’s chief scientist, Dr. Soumya Swaminathan, said the consensus for now was that the I.F.R. is about 0.6 percent — which means that the risk of death is less than 1 percent.

Although she did not note this, 0.6 percent of the world’s population is 47 million people, and 0.6 percent of the American population is 2 million people. The virus remains a major threat…

According to data gathered by The New York Times, China had reported 90,294 cases as of Friday and 4,634 deaths, which is a C.F.R. of 5 percent. The United States was very close to that mark. It has had 2,811,447 cases and 129,403 deaths, about 4.6 percent…

And now, new factors are being introduced into the equation. For example, new evidence that people with Type A blood are more likely to fall deathly ill could change risk calculations. Type A blood is relatively rare in West Africa and South Asia, and very rare among the Indigenous peoples of South America.