Frequency of E. coli ETEC positive for K88 fimbriae (F4) in farms with post-weaning diarrhea in Brazil - Moreno, M; Eckhardt, O; Nadeau, E; Ferreira Neto, José Soares; Felizardo, Maria Roberta; Gomes, V. T. M; Moreno, Andrea Micke (International Pig Veterinary Society (IPVS) Congress, 2014)