LONDON (AP) — AstraZeneca and Oxford University on Wednesday acknowledged a manufacturing error that is raising questions about preliminary results of their experimental COVID-19 vaccine. A statement describing the error came days after the company and the university described the shots as “highly effective” and made no mention of why some study participants didn’t receive as much vaccine in the first of two shots as expected. In a surprise, the group of volunteers that got a lower dose seemed to be much better protected than the volunteers who got two full doses. In the low-dose group, AstraZeneca said, the vaccine appeared to be 90 percent effective. In the group that got two full doses,
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