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Adaptive immune components from conventionally reared but not GF mice limit Hib colonization. The density of Hib PC+ in the nasal lavage fluid of conventionally reared BALB/c mice (WT), GF BALB/c mice (WT-GF), and GF SCID mice (SCID-GF) at 7 days p.i. The log CFU/ml of Hib in the lavage fluid is indicated for each mouse, and horizontal bars denote mean values. The dashed line indicates the limit of detection.
