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Measles, Mumps and Rubella Combined Vaccine, Live (MMR) is prepared by inoculating primary chicken embryo cells with attenuated strain of measles virus Hu-191 and attenuated strain of mumps virus S79 respectively, and inoculating human diploid cells with attenuated strain of rubella virus BRD Ⅱ, cultivating and harvesting the virus solution, mixing and preparing in proportion, adding appropriately diluted stabilizer and then lyophilizing.