>Breaks in cold chain storage have inactivated vaccines have been documented to leading to outbreaks in other disease states. Surely there's got to be some exi

>Breaks in cold chain storage have inactivated vaccines have been documented to leading to outbreaks in other disease states. Surely there's got to be some existing shipping indicator to track if a shipment has exceeded the temperature limits during transit. Even just a vial filled with a liquid that freezes at e.g. -70C would work just by tipping it upside down when frozen.