FIG. 5.

A bactericidal assay comparing the sensitivities of wild-type M. catarrhalis 7169 and the ompB1 isogenic mutant 7169b12 to MAb 11C6. In the presence of MAb 11C6 and 15% NHS, the wild type (•) exhibited a 99% decline in viability. In contrast, the viability of 7169b12 (■) was unaffected under the same conditions. As controls, the mutant (×) and the wild type (⧫) were incubated with 15% NHS and the mutant (▵) and the wild type (□) were incubated with 45% heated-inactivated NHS plus MAb 11C6.