Moderna says FDA delayed RSV vaccine approval to end of May

 Moderna on Friday said the Food and Drug Administration has delayed the approval of its vaccine for respiratory syncytial virus to the end of May due to “administrative constraints” at the agency.

The FDA was expected to make a decision on the RSV shot on Sunday. The agency has not informed Moderna of any issues related to the vaccine’s safety, efficacy or quality that would prevent its approval, the biotech company said in a release.

Investors are watching the upcoming approval closely as Moderna tries to rebound from the rapid decline of...