(noun) the reproduction number of an infectious disease, or the number of people to whom each infected person typically spreads the virus while infectious
Every four years, the Winter Olympics rolls around and people become overnight experts in the sport of curling, dropping the newly acquired jargon into our small talk.
This year the same thing has happened with epidemiology. No casual catch up is complete without a brief discussion (or heated argument) about excess deaths, false positives, case fatality rates and, of course, the R number.
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