A study released Thursday found that one dose of the Pfizer-BioNTech or AstraZeneca vaccines “barely” offers any protection against the delta variant of COVID-19.
The spread of the Delta variant in relatively unvaccinated parts of the U.S. is getting worse.
Nationwide, the number of new Covid-19 cases is holding steady. But that steadiness hides two dueling realities, in two different Americas.
In many urban and suburban communities, Covid continues to plummet. The rate of new daily cases has fallen below three per 100,000 residents in large cities like Atlanta, Boston, Chicago, Detroit, Houston, Minneapolis, New York, Philadelphia, San Francisco and Washington. As a point of comparison, the national rate of new daily cases peaked last winter above 75 per 100,000 people.
Information about the characteristics of these variants is rapidly emerging. Scientists are working to learn more about how easily they spread, whether they could cause more severe illness, and whether currently authorized vaccines will protect people against them.
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