Table 1.

Different severe infection occurred time to time and their comparison with COVID-19

Sl No	Disease	Causative organism	Year of infection	Place of origin	No of infection	No of Death	Reference
1	Coronavirus Disease 2019 (COVID-19)	SARS-CoV-2	2019–2020 (27, August)	Wuhan, China	24,021,218 cases from 216 countries	821,462 deaths from 216 countries	(2)
2	Severe Acute Respiratory Syndrome (SARS)	SARS-CoV	2002–2003 (July)	Guangdong province, China	8,096 cases from 17 countries	774 deaths from 17 countries	(3)
3	Middle East Respiratory Syndrome (MERS)	MERS-CoV	2012–2010 (January)	Saudi Arabia	Total 2,519 cases reported in 27 countries	866 deaths reported in 27 countries	(4)