How Infectious is COVID-19?

Experts estimate that for every person infected with COVID-19, between 2 and 3.5 people will become infected.

This is more infectious than novel influenza A (H1N1 in 2009), for which 1 person with the disease was estimated to infect about 1-2 people.

However, COVID-19 is much less infectious than diseases like mumps or measles, where on case of illness can lead to 10-15 people getting infected.

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