Delicate Covid Vaccines Slow Rollout ā Leading to Shots Given Out of Turn or, Worse, Wasted
āThaw. Rest 15 minutes. Do not shake. Do not refreeze.āDo not shake. Do not refreeze.ā Modernaās vaccine comes with complicated instructions. And both available vaccines are good for only six hours once the vial is open. So at dayās end, health workers are left to either throw out precious doses or get shots into any arm thatās available.