Evaluation of the number of bacteria within the <i>C. elegans</i> digestive tract.

After 72 hr of infection, the C. elegans were washed and ground, and dilutions of the resulting suspension were plated on selective media. The number of CFU per worm of the different strains alone or in combination was calculated. Three replicates were performed for each bacterial combination. E. faecium was used as negative control. No statistical difference could be demonstrated. Range of values are indicated into [square brackets] *Strain 1 corresponded to the first strain with ψ; strain 2 corresponded to the second strain when associations were tested.