P. aeruginosa alginate-facilitated bacterial persistence depends on the bacterial species. CF mice were infected with B. cepacia, B. multivorans, B. cenocepacia BC45, nontypeable H. influenzae, or S. maltophilia suspended in P. aeruginosa alginate. The bacterial load in the lungs was measured at 3 days postinfection. The symbols indicate results for individual animals, and the bars indicate geometric means calculated from two independent experiments.