Survival of immunocompromised C. elegans fed Legionella. (A) Kaplan-Meier survival plot of C. elegans N2 (squares, n=45), sek-1(km4) (circles, n=44), and nsy-1(ag3) (triangles, n=45) fed L. pneumophila Philadelphia-1 type strain. (B) Kaplan-Meier survival plot of C. elegans N2 (squares, n=45), sek-1(km4) (circles, n=46), and nsy-1(ag3) (triangles, n=44) fed L. longbeachae type strain. P < 0.0001 by pairwise comparison by the log-rank test of each of the nematode strains [sek-1(km4) and nsy-1(ag3)] versus wild-type N2 for both Legionella strains. Data are representative of one of three independent experiments.