Table 2.

Comparison between SARS, MERS, and COVID-19 [40].

	SARS	MERS	COIVD-19
Pathogens	SARS –CoV	MERS-CoV	SARS –CoV-2
Transmission	Sneeze, cough, breath or talk	From human to human,	Droplets formed by cough, sneeze, or talk
Period of incubation	2–7 days	–	2–14 days
Symptoms	A dry cough at first with fever, diarrhoea in the first or second week and illness (or both weeks)	A cough, a fever and shortness of breathing	A dry cough, a fever and shortness of breathing
Under risk categories	Persons with causal medical conditions	Group of men beyond the age of 60, (high blood pressure, mostly diabetes and kidney failure persons)	Group of adult's age of 65 ages and all persons with casual medical conditions.
Treatment	Not any	Not any	Not any
Vaccine	Not any	Not any	No vaccine while quite a few applicant vaccines are in progress