CDR
SARS-CoV	2002-2003	10%	contaminating at least 8,098 people and eliminating a minimum of 774
MERS-CoV	-2020	34%	2,519 cases of MERS and 866 associated deaths from the infection.
Seasonal Flu (US)		0.1-0.2%
Ebola	2014-16	40%
Swine Flu (H1N1 variation)	2009	<0.1%	151,700 to 575,400 - might have contaminated over 1 billion
 
Why Did The World Shut Down For COVID-19 However Not Ebola, SARS Or Swine Influenza?

SARS and MERS didn't cause the same level of devastation that COVID-19 has largely since they aren't as easily transmitted. Rather than moving by casual, person-to-person transmission, SARS and MERS spread from much closer contact, in between family members or health-care workers and patients (or, when it comes to MERS, from camels to people straight). These infections also aren't spread through pre-symptomatic transmission