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Cases of the COVID-19 delta variant continue to increase at a rate that would bring some California counties back to the purple level in the state’s now expired plan to reopen.
As expected, the delta variant is now the dominant strain in the United States, accounting for 83% of the country’s current cases, a big jump from 50% in the week of July 3.
In California, nearly half of all new cases of COVID-19 are of the delta variant. For this reason, 17 counties in California now recommend that even fully vaccinated people wear masks indoors. All Bay Area counties except Solano County are included.
Los Angeles County is the only county in California to require the return of masks indoors.
Health officials in the region and country continue to urge people to get vaccinated because all licensed vaccines offer protection against the delta variant and because most new COVID-19 infections are from people who are not vaccinated.
However, a new study from New York University, which has not yet been published, suggests that the Johnson & Johnson single-injection vaccine may be less effective against the variants than Pfizer’s other two-dose COVID-19 vaccines. and Moderna. The researchers analyzed blood samples from people who received one of the three vaccines and found that the J&J vaccine was not as effective against the delta and lambda variants.
The study, which suggests those who received the J&J vaccine may need a booster, has not yet been peer-reviewed or published in a medical journal.
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