Oxford COVID-19 vaccine trial paused after 'unexplained' illness in participant. What does it mean?

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Pharmaceutical major AstraZeneca, who is developing a coronavirus vaccine in association with Oxford university, has paused their trials after a participant fell ill due to a "suspected adverse reaction", the company stated, as reported by medical journal Stat News. "As part of the ongoing randomised, controlled global trials of the Oxford coronavirus vaccine, our standard review process was triggered and we voluntarily paused vaccination to allow review of safety data by an independent committee