Ninety-one F4 + pathogenic Escherichia (E.) coli and 181 F18 + pathogenic E. coli were isolated from piglets suffering enteric colibacillosis during 2007-2016. These strains were analyzed for O-serogroups, adhesin genes (eae, paa, AIDA-1), toxin genes (LT, STa, STb, Stx2e, EAST-1), and their susceptibility to 16 antimicrobials using disc diffusion method. We found that O149 and O139 were predominant serogroups in F4 + E. coli (36.3%) and F18 + E. coli (16.6%), respectively. AIDA-1 was the most

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... redominant adhesin gene in F18 + E. coli (26.5%) while paa was the most predominant adhesin gene in F4 + E. coli (30.8%). LT (70.3%), STb (84.6%), and EAST-1 (73.6%) were detected with high frequency in F4 + E. coli. However, STa (43.6%) and Stx2e (49.2%) were the predominant toxin genes detected in F18 + E. coli. Both F4 + and F18 + E. coli showed high resistance to tetracycline (F4 + : 91.2%, F18 + : 90.6%), chloramphenicol (F4 + : 87.9%, F18 + : 92.3%), and streptomycin (F4 + : 89.0%, F18 + : 84.0%). F18 + E. coli showed higher resistance to colistin (9.4%) rather than F4 + E. coli (2.2%). In summary, we compared serogroups, virulence factors, and antimicrobial susceptibility of F4 + and F18 + E. coli from diarrheic weaned piglets. Results of this study could be used to design control measures for enteric colibacillosis in piggeries. To Cite This Article: Do KH, Byun JW and Lee WK, 2019. Serogroups, virulence genes and antimicrobial resistance of F4 + and F18 + Escherichia coli isolated from weaned piglets. Pak Vet J, 39(2): 266-270. http://dx.