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Gastritis score for acute (polymorphonuclear leukocytes) inflammation on a scale of 0 (none), 1 (mild), 2 (moderate), or 3 (severe) as described in the Sydney System (30). Data are shown for each animal in the control, oral vaccine (PO), and parenteral vaccine (IM) groups before immunization (0 week), 4 weeks after challenge (18 weeks), and 11 weeks after challenge (25 weeks).
