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U.S. Unlikely to Reach ‘Herd Immunity’ , Experts Now Believe

Early in the pandemic, when vaccines for the coronavirus were still just a glimmer on the horizon, the term “herd immunity” came to signify the endgame: the point when enough Americans would be protected from the virus so we could be rid of the pathogen and reclaim our lives.

Now, more than half of adults in the United States have been inoculated with at least one dose of a vaccine. But daily vaccination rates are slipping, and there is widespread consensus among scientists and public health experts that the herd immunity threshold is not attainable — at least not in the foreseeable future, and perhaps not ever.

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More on the Indian variant that is adding to the country's coronavirus problems.

This 'double mutant' variant is adding fuel to India's COVID-19 crisis

Human behavior is probably more to blame for the second wave of the COVID-19 pandemic than the new mutants arising around the country. But the combination of these two is proving catastrophic.

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South America Suffers Worst Pandemic Death Tolls Yet

BOGOTÁ, Colombia — In the capital of Colombia, Bogotá, the mayor is warning residents to brace for “the worst two weeks of our lives.”

Uruguay, once lauded as a model for keeping the coronavirus under control, now has one of the highest death rates in the world, while the grim daily tallies of the dead have hit records in Argentina, Brazil, Colombia and Peru in recent days.

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India's vaccination drive falters amid rising record virus toll

With India preparing to make residents 18 and older eligible for a coronavirus vaccine starting Saturday, Dr. Aqsa Shaikh emailed the country’s largest drug manufacturer this week asking for doses for the vaccination center she runs in New Delhi.

The response was not encouraging: The company, the Serum Institute of India, said it was so overwhelmed by demand that it could take five or six months for Dr. Shaikh to get the 3,000 doses per month she requested.

“When I read that email, images of mass burials appeared in front of my eyes,” she said. “We may have to shut down the center now if the government doesn’t chip in.”

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