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Transmission of Bordetella bronchiseptica RB50 and RB50Δteps in C3H/HeJ mice. Graph represents the bacteria recovered from the nasal cavities of naive C3H/HeJ mice co-housed for 21 days with mice infected with either RB50 (black circle) or the RB50Δteps mutant (black square). The results represent observations from several independent assays and the asterisks indicate significant differences (**P ≤ .001)
