L. plantarum G83 was grown in De Man, Rogosa, and Sharp broth at 37°C for 24 h. Meanwhile, the ETEC K88 strain (O8:H19:F4ac+, LT+, STa−, STb+) was obtained from the China Institute of Veterinary Drug Control (Beijing, China) and grown in Luria–Bertani broth containing 5% fetal bovine serum at 37°C for 12 h.