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BatB is not necessary for the colonization of the nasal septum and trachea of rats. Three- to 4-week-old female Wistar rats were inoculated with 1,000 CFU of either RB50 (black circles) or RBAT (white circles). Each circle represents the number of CFU recovered from a single rat. The horizontal line represents the average number of CFU. The dashed line represents the lower limit of detection.
