Johnson & Johnson Vaccine Trial Paused Due To ‘Unexplained Illness’ In Participant

The Phase 3 trial of Johnson & Johnson’s COVID-19 vaccine candidate has been paused as the company investigates what it says is a study participant’s “unexplained illness.”

Cheryl Gerber / AP

Updated at 12 p.m. ET

Johnson & Johnson has paused all clinical trials of its experimental COVID-19 vaccine after a study participant became sick with an “unexplained illness.”

In a statement on Monday, the company said it had “temporarily paused further dosing in all our COVID-19 vaccine candidate clinical trials,” including a Phase 3 trial that began late last month, while it investigated the illness.