It said it was trying to expedite the review to “minimize any potential impact on the trial timeline.”
An individual familiar with the development said researchers were told the hold was placed on the trial out of “an abundance of caution” after a suspected serious adverse reaction in a participant in the United Kingdom, according to STAT News.
It’s unclear how long the hold on the trial will last. AstraZeneca began its trial late last month and is one of three companies currently in late-stage testing for a potential vaccine. The other two are Pfizer and Moderna, which both began their trials in late July.
In July, the company published data that showed its vaccine produced a promising immune response in an early-stage trial.
The vaccine was found to be well-tolerated and there were no serious adverse events, according to the researchers at the time. Fatigue and headache were the most commonly reported, they said. Other common side effects included pain at the injection site, muscle ache, chills and a fever