Table 2. Human respiratory viruses with substantial health impact.

Name	Case Fatality Rate	Time Asym. N.Inf. (days)	Asym. Inf.	Time Sym. (days)
MERS-CoV	0.35	2–14	minimal	up to 90
Variola major (smallpox)	0.3	7–19	assumed no	9–11
SARS-CoV	0.15	6	assumed no	20
Measles morbilivirus	0.04-0.1	6–21	< one week	6–8
SARS-CoV-2	<0.02	5–14	< one week	21
Influenza	<0.002	2	< one week	3
Mumps rubulavirus	near 0	16–18	< one week	6–9
Rubella virus	near 0	14–18	up to two weeks	largely asymptomatic, symptomatic period largely not infectious
Rhinovirus	near 0	Time course varies, can be infectious for weeks, or wholly asymptomatic, or symptomatic on the first day of infectious period.
Human respiratory syncytial virus	near 0	Can be wholly asymptomatic
Human parainfluenza	near 0	Can be wholly asymptomatic
Alphacoronavirus	near 0	Time course varies, can be wholly asymptomatic