Table 1.

Different human CoVs and their symptoms.

S. no	CoV Strain	Types	Symptoms associated with CoVs	Year	References
1	Human CoV OC43	Beta	Fever, cough upper respiratory tract infections and fatal encephalitis	1960	[18]
2	Human CoV HKU1	Beta	Respiratory tract illness, pneumonia and flu-like symptoms	2005	[19]
3	Human CoV 229E	Alpha	Common cold	1960	[20]
4	Human CoV NL63	Alpha	Bronchiolitis and pneumonia	2004	[21]
5	Human SARS-CoV	Beta	Respiratory illness, shortness of breath, fever, chills, malaise and dry cough	2003	[22]
6	Human MERS-CoV	Beta	Fever, chills, cough, pneumonia, shortness of breath, and GIT symptoms includes diarrhea	2012	[23]
7	COVID-19 (SARS-CoV-2)	Beta	Flu-like symptoms, nausea, respiratory illness, pneumonia, shortness of breath and diarrhea	2019	[24]