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BatB is not necessary for persistence in the lower respiratory tract of mice lacking B and T cells. Three- to 4-week-old SCID mice were inoculated with 5 × 105 CFU of RB50 (black circles with solid black line), RBAT (gray triangles with dashed gray line), or RBatpp (black triangles with dashed black line). A dotted line indicates the lower limit of detection. Two asterisks denote a result that is significantly different from that for RB50, with a P value ≤0.01.
