In California, Covid caseloads and hospitalizations, which were already well below the national average, have been falling for about two weeks….
… If anything, statewide comparisons understate the power of the vaccines; every state, including California, has areas with relatively low vaccination rates. When you instead look at California on a county basis, the picture is striking….
Check out the strong relationship between vaccination and hospitalization rates in California’s countries. nytimes.com/2021/09/15/bri… 
The San Francisco Bay Area has a hospitalization rate that remains lower than the U.S. rate was for much of this year, before Delta was widely circulating. If the rest of the country looked like the Bay Area, the Delta surge would not have been nearly so bad.
And on an individual level, the vaccines are more effective than the county data suggests. In San Francisco, most hospitalized people are part of the small share of residents who remain unvaccinated.
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