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(A) The pig fed the basal diet and orally infused with the sterile essential medium; (B) the pig fed the APOS supplementing diet and orally infused with the sterile essential medium; (C) the pig fed the basal diet and orally infused with rotavirus; (D) the pig fed the APOS supplementing diet and orally infused with rotavirus. (Original magnification, 100 ×).
