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Gastritis scores in vaccinated SPF and GF mice at 3 (A) and 10 (B) weeks p.i. Hematoxylin-eosin-stained gastric sections were scored for grade of inflammation (grades 0 to 3) as described in the text. The data represent the means plus the standard deviations for 10 (SPF) or 7 (GF) mice. ✽, P < 0.05 (i.e., significantly different from the control CT group [Nonvaccinated with infection]).
