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Recovery of B. anthracis from guinea pig muscle after inoculation with 109 spores of three recombinant anthrax strains. Bacteria were assayed by dilution and plating 1, 3, and 7 days after inoculation of 109 spores of strains ΔANR(pPA102) (○), ΔSterne(pPA102) (▵), ΔSterne(pJB2) (□). The values shown are mean CFU per milliliter ± the standard deviation of three animals killed at each time point.
