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Total αPA ELISA titers in rabbits that were infected i.v. with Vollum∆pXO2 or Vollum∆pXO2∆bslA. Total αPA-specific antibodies were determined in the serum of rabbits infected i.v. with Vollum∆pXO2 (blue circles) or Vollum∆pXO2∆bslA (red rectangles). Units are E-1 of the highest serial dilution that presented a signal-to-noise ratio of at least 2.
