AstraZeneca has paused its COVID-19 vaccine trial after a participant in the UK experienced an adverse reaction. This is the first known suspension of a phase three COVID-19 vaccine trial. Experts note that such pauses are not uncommon and are part of routine safety reviews. The trial, which aims to enroll 30,000 participants in the US, is under scrutiny, and more information is expected soon. A data safety monitoring board will review the trial data to ensure safety. Pharmaceutical companies assure the public that a vaccine will only be introduced once it is safely approved.

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