Previously immunized mice were rechallenged by inoculation of burn wounds with P. aeruginosa 4 days after burn injury. Mice received control treatment (LR) or FL for 5 days, beginning on the day of injury. Sera were harvested 4 days after infection for assessment of P. aeruginosa-specific or total (A) IgG, (B) IgA, and (C) IgM antibodies by ELISA. Relative values are shown, expressed as O.D. × sample dilution factor. n=13 mice/group, representative of 3 separate experiments. *significantly different than LR group, p<0.05.