This experiment aimed to investigate the effects of a symbiotic, consisting of microencapsulated Lactobacillus plantarum (MLP) and fructooligosaccharide (FOS) on growth performance, blood immune parameters, and intestinal microbiota in weaned piglets. Ninety weaned piglets were assigned to three dietary groups (CON: basal diet; ANT: basal diet + aureomycin; SYN: basal diet + MLP and FOS) for a four-week trial. Compared to CON, pigs in the SYN group had higher weight gain and feed intake, and lower diarrhea rate (P