SARS has a very high prevalence of serious illness, making identification of cases and transmission easier. SARS also has a low risk of transmission before the development of severe illness. Both SARS and COVID-19 may be spread by asymptomatic carriers.
In general, COVID-19 is also clinically milder than Middle East respiratory syndrome (MERS) or SARS in terms of severity. The case fatality rate of the SARS outbreak was 11%. The case fatality rate associated with COVID-19 is still under investigation; however, it does appear to be lower than that for both SARS and MERS. Although the case fatality rate associated with SARS is higher, COVID-19 has resulted in a greater number of deaths.
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Cite this: Michael Stuart Bronze. Fast Five Quiz: Severe Acute Respiratory Syndrome (SARS) - Medscape - May 04, 2020.