COVID-19 cases could also possibly have been missed early in the outbreak, given that its symptoms are similar to influenza and since the early part of the outbreak coincided with the flu season in the northern hemisphere.
Other possible explanations for that finding include an unusually long incubation period but that would be harder to prove. The other big difference between SARS and COVID-19, especially in countries previously affected by SARS, is the high degree of healthcare worker protection, which may mean lower rates of infections in medical professionals working on the frontlines.
Travelers wear masks in John F Kennedy International Airport in New York, U.S., amid coronavirus reports, March 11, 2020. REUTERS/Lucas Jackson Scientists are speculating what proportion of the population will get infected in that case. For H1N1 in 2009, we know that figure was around a quarter of the population after the first wave of infections.
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