In our study, just 20% of cases, all of them involving social gatherings, accounted for an astonishing 80% of transmissions. Another 10% of cases accounted for the remaining 20% of transmissions — with each of these infected people on average spreading the virus to only 1 other person, maybe 2 people. This mostly occurred within households. No less astonishing was this corollary finding: 70% of the people infected did not pass on the virus to anyone.

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