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> efficacy of 63.09% against symptomatic SARS-CoV-2 infection This sentence means the vaccine prevents symptoms , as stated on the CDC website. This sentence does not mean the vaccine prevents infection, no matter how much someone wants that to be true. Recovery from Covid prevented infection in 99% of 5 million UK people. People who are pre-symptomatic or asymptomatically infected, especially with Delta, are extremely contagious and thus dangerous to other people. For this reason, the CDC recommends testing of vaccinated people after exposure, since the vaccine suppresses symptoms that would otherwise cause people to self-isolate, link > Based on evolving evidence, CDC recommends fully vaccinated people get tested 5-7 days after close contact with a person with suspected or confirmed COVID-19. In other words, vaccinated+infected+asymptomatic people are much more infectious and dangerous than Covid-recovered people. > What does "swept" mean? It means a 2020 graph like this one for New York, with a city-wide density of cases that is much higher than other parts of the USA in a comparable timeframe, link Logic dictates that essential workers who were serving the public would have faced the highest risk of exposure. If people in a high-risk subset of 2020 workers, in one of the highest-risk cities in the USA were not infected with Covid in 2020, why would they be infected in 2021 when overall rates of infection are dramatically lower? Either they got infected in 2020 and the