Table 1.

Different types of human coronavirus (HCoVs).

Discovery	HCoV genera	Coronaviruses	Natural Host	Cellular receptor
1966	α-CoV	HCoV-229E	Bats	Human aminopeptidase N (CD13)
1967	β-CoV	HCoV-OC43	Cattle	9-O-Acetylated sialic acid
2003	β-CoV	SARS-CoV	Palm Civets	ACE2
2004	α-CoV	HCoV-NL63	Palm Civets, Bats	ACE2
2005	β-CoV	HCoV-HKU1	Mice	9-O-Acetylated sialic acid
2012	β-CoV	MERS-CoV	Bats, Camels	DPP4
2019	β-CoV	SARS-CoV-2	Bats, ?	ACE2