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ANALYSIS: Five reasons why COVID herd immunity is probably impossible

https://www.nature.com/articles/d41586-021-00728-2

As COVID-19 vaccination rates pick up around the world, people have reasonably begun to ask: how much longer will this pandemic last? It’s an issue surrounded with uncertainties. But the once-popular idea that enough people will eventually gain immunity to SARS-CoV-2 to block most transmission — a ‘herd-immunity threshold’ — is starting to look unlikely.

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OVERVIEW: COVID-19 International briefs

(Reuters) - Nearly a dozen countries resumed use of AstraZeneca’s COVID-19 shots on Friday as EU and British regulators said its benefits outweighed any risks. Reports of rare instances of blood clotting had temporarily halted inoculations.

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OVERVIEW: Coronavirus development briefs, Europe and elsewhere

(Reuters) - Britain said on Thursday that there were lumps and bumps in the global vaccine supply chain that were causing slower than expected deliveries and scolded the European Union for threatening to slap a ban on vaccine exports.

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Some Long Covid Patients Feel Much Better After Getting the Vaccine

...a number of people ...are reporting that the post-Covid symptoms they’ve experienced for months have begun improving, sometimes significantly, after they got the vaccine. It’s a phenomenon that doctors and scientists are watching closely, but as with much about the yearlong coronavirus pandemic, there are many uncertainties.

Scientists are only beginning to study any potential effect of vaccines on long Covid symptoms. Anecdotes run the gamut: Besides those who report feeling better after the shots, many people say they have experienced no change and a small number say they feel worse.

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