Delicate Covid Vaccines Slow Rollout — Leading to Shots Given Out of Turn or, Worse, Wasted | Kaiser Health News

Delicate Covid Vaccines Slow Rollout — Leading to Shots Given Out of Turn or, Worse, Wasted | Kaiser Health News: “Let rest. Do not shake. Do not refreeze.” Moderna’s vaccine comes with complicated instructions. And both available vaccines are good for only six hours once the vial is open. So at day’s end, health workers are left to either throw out precious doses or get shots into any arm that’s available.