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Colonization of mouse respiratory tract. BALB/c mice were inoculated intranasally with 5 × 105 CFU of either wild-type W28 (WT), W28 PT-9K/129G (PT*) or W28 PTDM B. pertussis strains, and bacterial loads in the respiratory tract were assayed 4 days post-inoculation. n = 5 mice per treatment group. Asterisks indicate statistically significant differences by t test (p < 0.02).
