While most vaccines can stay on the shelf unopened for months, once a vial is opened the clock starts ticking. Moderna vaccines come in vials containing 11 to 15 doses. Pfizer vials contain up to six doses and Johnson & Johnson vials five doses. "We are going to see more doses that go unused over time," said Wisconsin's health secretary, Karen Timberlake. State health officials said they have tried to request only what health care providers and pharmacies expect to need from the federal supply.

Source: Daily Sun September 26, 2021 16:41 UTC