FIG. 2.

Opsonic killing of P. aeruginosa isolates by MAb F429. Growth of nonmucoid isolates in a low-oxygen environment promotes expression of alginate and under these conditions two of three invasive strains (A) and all three cytotoxic strains (B) are effectively killed by MAb F429 in the presence of polymorphonuclear leukocyte and complement. P. aeruginosa strain PAO1ΔalgD, unable to produce alginate due to disruption of the algD gene, is not killed (A). Points indicate averages of duplicate samples.