Hospitalized fraction ha, rof untreated severe cases
low risk group (r = r1)
high risk group (r = r2)
Case fatality daof hospitalized cases
Independent of age a and risk group r, a fraction ca, r(A) = 33% of infections result in asymptomatic cases, a fraction ca, r(M) = 33.5% become moderately sick and the remaining fraction develops severe disease. An age- and risk-dependent fraction ha, rof untreated patients with severe disease needs hospitalization. An age-dependent fraction daof hospitalized cases dies. Sources: fraction of asymptomatic cases: ; 50% of symptomatic cases see a doctor: ; hospitalizations per severe case: ; case fatality of hospitalized, but untreated patients calculated from .