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Live vaccines are sensitive to heat. MMRV, varicella, and zoster. vaccines must be stored in a continuously frozen state in a freezer at. 5Â°F (-15Â°C) or colder until administration. MMRV, varicella, and. Live vaccines are. sensitive to heat. zoster vaccines deteriorate rapidly after they are removed from the freezer.
Live vaccines contain a weakened or attenuated form of a virus or bacteria. They are altered so that they can't cause disease. The other main type of vaccine is made of the inactivated virus or bacteria (whole vaccine) or just parts of the virus or bacteria (fractional vaccine).