SPP1 and infection: To determine if L. zeae LB1 regulates the production of antimicrobial peptides and other defense molecules in C. elegans responding to DT104 infection, the life-span of mutants ok3366 (defective in abf-3), ok1384 (defective in lys-7), ok2703 (defective in spp-1), zu67 (defective in skn-1), gk235 (defective in sod-3), and nk3 (defective in dbl-1) were investigated with or without LB1 pretreatment.