Liquid shielding, its manufacturing method, and the face mask subvisor

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Live Sendai viruses are modified in fertile chicken egg embryos to be administered as a vaccine through an aerosol for the immunization of animals against Sendai disease. The live Sendai viruses are diluted by at least thirty-one passages in fertile chicken egg embryos. Twenty passages are at a lower than normal incubation temperature and the remaining passages are at the normal incubation temperature.

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