Table 1.

List of seven CoVs known to infect human.

Virus	Genera	Symptoms
Human CoV-229E	Alphacoronavirus	Mild upper respiratory disease, in rare cases can cause severe infection in infants, young children and elders
Human CoV-NL63	Alphacoronavirus
Human CoV-OC43	Betacoronavirus
Human CoV-HKU1	Betacoronavirus
SARS-CoV	Betacoronavirus	Severe acute respiratory syndrome, about 10% mortality rate
MERS-CoV	Betacoronavirus	Severe acute respiratory syndrome, about 37% mortality rate
SARS-CoV	Betacoronavirus	Severe acute respiratory syndrome, about 2.3% mortality rate