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No meaningful differences in mean laboratory values were seen between those with a PASC index of 12 or higher versus 0.
Americans will not be able to order free at-home COVID tests after Friday, US health officials announced Tuesday.
A trove of previously unpublished genetic data suggests COVID-19 may have originated in raccoon dogs.
Primary series coverage by the end of 2022 was below the 100% target set for at-risk populations.
Pfizer also is working to improve its current COVID-19 vaccine “to address any future variant of potential concern, if needed.”
The risk was higher for people who were aged 65 years or older, immunosuppressed or had at least one of six underlying conditions.
Although the paper will rekindle debate over whether the pandemic resulted from animal-to-human transfer, it likely will not settle the issue.
Reasons why doses may be marked as wasted include a cracked vial, an error diluting the vaccine or a freezer malfunction.
Higher symptom intensity was seen among older people, women and non-white individuals.
Updated shots to shield against COVID-19 infection were approved by the US Food and Drug Administration on Thursday.