Shares of Moderna Inc fell 7% on Thursday after medical news site STAT reported a delay in a large trial testing the biotech’s potential coronavirus vaccine as the company makes changes to its study plan.
The late-stage trial, to test Moderna’s vaccine candidate in 30,000 volunteers, was expected to start next week.
Study plan changes are common and the company is still aiming to start the trial in July, according to the report.
Companies, including Pfizer and AstraZeneca Plc, are racing to develop a vaccine for COVID-19, the illness caused by the new coronavirus that has killed 516,370 worldwide.
“The furthest along in U.S. testing is an experimental vaccine from NIH’s vaccine research center in partnership with Moderna,” National Institutes of Health Director Francis Collins said at Senate Appropriations hearing earlier on Thursday.
“This month we’ll seek to enroll 30,000 volunteers with results expected in a few months.”