As new cases appear on the West Coast, some — including the president — see comparisons to the seasonal flu. Here’s a close look at the differences. Which virus is deadlier? The coronavirus seems to be more deadly than the flu — so far. On average, seasonal flu strains kill about 0.1 percent of people who become infected. The 1918 flu had an unusually high fatality rate, around 2 percent. Because it was so contagious, that flu killed tens of millions of people. You have 1 free article remaining. Subscribe to the Times Early estimates of the coronavirus death rate...