Novavax Studies for Flu, Covid Vaccines on Hold Over Safety (2)

Novavax Inc. shares fell 19% after US regulators placed a hold on the company’s experimental vaccines because a study volunteer developed a serious nerve disorder.

The pause applies to the company’s stand-alone influenza shots and the influenza and Covid combination vaccine, Novavax said in a statement. Chief Medical Officer Robert Walker said the company doesn’t believe causality has been established and it’s working with regulators to resolve the issue.

The volunteer who developed motor neuropathy, which led to problems with movement, had received a combination flu and Covid shot in January 2023 as part of a study taking place ...