A late stage clinical trial for a potential COVID-19 vaccine was brought to a premature halt on Tuesday due to an unexplained and potentially serious illness experienced by a trial participant.

AstraZeneca said they had taken "routine action" in voluntarily pausing progress on trials for the vaccine, which was developed with researchers from the University of Oxford. The company began to recruit up to 30,000 U.S. participants for Phase 3 trials in late August, joining others already taking part in the U.K., Brazil and South Africa.

"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," an AstraZeneca spokesperson said in a statement obtained by Newsweek.

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