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If varicella vaccine can be kept in the refrigerator for 72 hours and MMR vaccine can be stored in the refrigerator, why can’t MMRV be stored in the refrigerator?

April 26, 2017hours MMR mmrv refrigerator vaccine varicella

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If varicella vaccine can be kept in the refrigerator for 72 hours and MMR vaccine can be stored in the refrigerator, why can’t MMRV be stored in the refrigerator?

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There is a lot more varicella vaccine virus in MMRV than in single-antigen varicella vaccine. The manufacturer storage data does not demonstrate adequate viability of the vaccine viruses in MMRV when stored at refrigerator temperatures.