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16M recovery from spleens and livers 1 week postchallenge in IRF-1−/− mice. Groups of four mice were vaccinated with 1 × 106 of either 16MΔvjbR or S19ΔvjbR for 8 weeks prior to challenge. Data are expressed as log10 number of CFU/organ in the spleens (A) or livers (B).
