Weight of E. foetida fed with different bacterial strains or in the presence of trehalose or NaCl. The weight of E. foetida individuals at 0 (black bars), 7 (light grey bars), 14 (dark grey bars), 21 (white bars), and 28 days (dotted bars) after feeding is shown. B. cepacia and NaCl 2% (w/v) were used as pathogenic and toxic controls, respectively. P. putida KT2440 was used as non-pathogenic control. The means and standard deviations of 5 individuals from three biological replicates are shown. Data were submitted to an ANOVA test and significant differences (P ≤ 0.05) and posthoc Tukey are highlighted by different single letters (after 28 days), double letters starting with a (after 21 days), double letters starting with b (after 14 days), double letters starting with c (after 7 days) and double letters starting with d (at time zero).