FIG 1.

Compared to adults, neonatal mice respond to orogastric Y. enterocolitica infection with enhanced early innate phagocyte recruitment to the MLN. Neonatal (●) and adult (■) wild-type C57BL/6 mice were orogastrically infected with 5 × 10⁸ CFU wild-type Y. enterocolitica. (A) Ly6G⁺ CD11b⁺ and Ly6G⁻ CD11b⁺ cell recruitment to the MLN was evaluated 18, 24, and 48 h postinfection by flow cytometry. (B) Ly6G⁺ CD11b⁺ and Ly6G⁻ CD11b⁺ cell recruitment to the MLN of neonatal mice or to the MLN and PP of adult mice 48 h postinfection with 5 × 10⁸ or 2.5 × 10⁹ CFU wild-type Y. enterocolitica. ns, not significant; *, P ≤ 0.05.