FIG 6 .

Deformation test confirming the limited metabolic capacity of S. poulsonii. Drosophila hemolymph containing S. poulsonii was extracted and incubated in phosphate buffer alone or complemented with glucose, fructose, trehalose, or arginine. Bacterial shape was then monitored by fluorescence microscopy. Representative images (A) and percentages of helical cells compared to the total cell counts after 7 days (B) are shown. S. poulsonii maintains its helical shape for 1 week in the presence of glucose but not fructose, trehalose, or arginine. Shown is the mean ± the standard error of the mean of data pooled from three independent experiments (n = >100; ***, P < 0.0001).