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Do yo have a link to the 5.7 estimate?
Coronavirus outbreak likely to go on for two years, scientists predict a news article but relevant source
Originally Posted by from previous citation
Covid-19′s R0 has been estimated between 1.4 and 5.7 in various studies — but CIDRAP noted a rating was difficult to establish due to variations in identifying and testing infected people between regions.


here is something more to the point
What Is R0? Gauging Contagious Infections
Originally Posted by from above citation
The R0 for COVID-19 is a median of 5.7, according to a study published online in Emerging Infectious Diseases. That’s about double an earlier R0 estimate of 2.2 to 2.7

both articles contain links to other source materials.

ignorance is the enemy
without equality there is no liberty
America can survive bad policy, but not destruction of our Democratic institutions