Effect of feeding isolates LB1 (<i>Lactobacillus zeae</i>) and CL11 (<i>Lactobacillus casei</i>) on the survival of <i>C. elegans</i> infected with ETEC JG280 and on bacterial colonization of the nematode intestine.

<p>(A) Survival (%) of <i>C. elegans</i> in the presence or absence of <i>Lactobacillus</i>. (B) Colonization of ETEC JG280 in the intestine of worms. (C) Colonization of <i>Lactobacillus</i> in the intestine of worms. Control worms were fed <i>E. coli</i> OP50 only, either isolate LB1 or CL11 at 10⁸CFU/ml for 8 days. In other treatments, worms were first fed either <i>E. coli</i> OP50 or <i>Lactobacillus</i> (isolate LB1 or CL11) at 10⁸ CFU/ml for 18 h and then ETEC JG280 for the remaining days. Treatments:○, <i>E. coli</i> OP50 only; ▪, <i>E. coli</i> OP50 and then ETEC JG280; □, isolate LB1 only; •, isolate CL11 only; △, isolate LB1 and then JG280; × isolate CL11 and then JG280. The curves of two treatments (□ and ○) were almost overlapped in Panel A.