Also, should we all be getting booster shots?
detailing an outbreak of COVID-19 following July 4 celebrations on Cape Cod, Massachusetts. And in light of it, on July 27, the CDC issued: All vaccinated and unvaccinated individuals should wear face masks when indoors or in crowds, to prevent COVID-19 spread.
The original nonvariant COVID-19 virus had an R0 of about 3, and we know from randomized controlled trials that the mRNA vaccines are about 95 percent effective at preventing severe death from the nonvariant virus. Now, a little math to get to the Re: We can estimate the Re in a given place and time by multiplying R0 by the proportion of the population that is currently susceptible to the disease . In mathematical notation, this is Re=R0.
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