Table 1: Key features of viruses responsible for deadly pandemics.

Virus	SARS-CoV-2	H1N1
Estimated Reproduction Number	2.24-3.58 (early phase) (40)	1.7-2.o (1st wave) (41)
Origin	Avian (Bat)	Avian (Waterfowl)
Intermediate Host	Unknown	Swine
Transmission	Respiratory Droplets	Respiratory Droplets
Target Organ	Lungs	Lungs
Complications	Respiratory failure, MODS, Septic shock	Bronchopneumonia, Pulmonary haemorrhage