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Effect of vaccination on bacterial colonization in SPF and GF mice at 3 weeks p.i. The number of bacteria per stomach was determined by a bacterial culturing system 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 [Non-vaccinated/infection]).
