[objectivetruth]

This is a different model of expiration. This isn't "two-year shelf life can be extended to five years w/ stable temperature and humidity and only a 10% loss of efficacy."

This is "once this vaccine is pulled out of the super-cold freezer, it starts breaking down, and you have X hours before it's worthless at best."

Worse than "worthless" is the idea that people might get a useless expired vaccine anyway, think they're protected, and then be a vector for future transmission.