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Wikipedia definition
1. Germ-free animalGerm-free animals are animals that have no microorganisms living in or on it. Such animals are raised within germ-free isolators in order to control their exposure to viral, bacterial or parasitic agents. When known strains of bacteria or microbiota are introduced to a germ-free animal, it usually referred to as a gnotobiotic animal, however technically speaking, germ-free animals are also gnotibiotic because the status of their microbial community is known.
Read “Germ-free animal” on English Wikipedia
Read “無菌動物” on Japanese Wikipedia
Read “Germ-free animal” on DBpedia

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