Fig 2. Percentage of piglets exhibiting diarrhea (i.e., fecal score ≥ 4) in the infected and noninfected groups (trial 1).

P-values for the main factors: infection: P = 0.01; days: P = 0.42; infection × days: P = 0.07. At four days post weaning (day 0), infected piglets were orally administered 5 ml of the ETEC F4 suspension containing 10⁸ CFU/ml, whereas NINF piglets received 5 ml of PBS orally.