35% of cases are asymptomatic (but still infectious), while the fatality rate for those with symptoms is .4% (so four times worse than the standard estimate for flu mortality); from a CNN article:
The fifth scenario is the CDC's "current best estimate about viral transmission and disease severity in the United States." In that scenario, the agency described its estimate that 0.4% of people who feel sick with Covid-19 will die.
For people age 65 and older, the CDC puts that number at 1.3%. For people 49 and under, the agency estimated that 0.05% of symptomatic people will die.
The article goes on to note one expert's skepticism about the fatality numbers as being too optimistic.
