Table 1.

Comparison of the seven human coronaviruses. The origin group, distribution, seasonality, and incubation period of each are shown

Strain	Group	Distribution	Season	Incubation
HCoV-229E	Alpha	Globally	Winter	2–5 d
HCoV-NL63	Alpha	Globally	Summer/Fall	2–5 d
HCoV-OC43	Beta	Globally	Winter	2–5 d
HCoV-HKU1	Beta	Globally	Spring/Summer	2–5 d
SARS-CoV	Beta	Globally	Winter	2–14 d
MERS-CoV	Beta	Arabian Peninsula	Variable	2–15 d
SARS-CoV-2	Beta	Globally	Winter?	2–14 d