Table 2.

Differences of SARS-COV, MERS CoV, SARS-COV-2.

	SARS-CoV	MERS-CoV	SARS-CoV-2
First notified	November 2002 in China’s Guangdong province	September 2012, in Saudi Arabia	December 2019 in Wuhan, China
Mode of transmission	Infected civets, droplets produced by sneezing, coughing, breathing, talking	Droplets from person to person (unclear from camels to humans)	Droplets by coughing, sneezing, talking
Mean incubation period	4−5 days	6−7 days	1−14 days
Key symptoms	Dry cough at first, fever, malaise, body aches and pains, diarrhea (in the first or second week)	Fever, cough, shortness of breath, nausea/vomiting, diarrhea	Fever, dry cough, shortness of breath, fatigue
Treatment	No specific treatment	No specific treatment	No specific treatment
Mortality rate	11%	34%	3−4%
Vaccine	No vaccine	No vaccine	No vaccine