Researchers still aren't sure how contagious COVID-19 is compared to other viruses, but it appears to spread more rapidly than the flu. “In public health we measure something called the R0 (pronounced 'R-naught') which is the average number of people infected by a person with the virus,” says Dr Brown. He goes on to explain that the R0 for influenza is about 1.3, meaning about 1.3 people get the virus from every ten who have the infection. Measles, on the other hand, is extremely contagious, with an R0 of 12-18. “We are still not sure what the R0 is for coronavirus, but it appears to be about 2.0, which is about the same as SARS,” Dr. Brown continues. “These are early estimates though and are likely to change as we get better data.”
In both the flu and coronavirus, however, the main method of transmission appears to be from person to person via respiratory transmission—essentially by coming in close contact (within six feet) with respiratory droplets from the coughs and sneezes of infected people. The flu and coronavirus also have similar periods of time when people are asymptomatic but still contagious. “It appears that with both viruses, people may be able to transmit the virus before they are symptomatic,” explains Dr. Juthani.
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