Table 1.

Outbreak of the virus in recent past

S. no.	Emergence of virus	Year	References
1	Severe acute respiratory syndrome coronavirus	2002	[5]
2	Influenza type 1 virus called the influenza virus H1N1	2009	[6]
3	Middle East respiratory syndrome virus	2012	[7]
4	Novel coronavirus or the severe acute respiratory syndrome coronavirus 2	2019	[8]