Study of 91 strains of Escherichia coli bacteria causing edema disease in piglets in South Viet Nam

Edema disease is caused by different serotypes of E, coli, the repartition of which varies according to region. From 135 lymphatic nodes of piglets with edema disease, 91 E. coli bacteria were isolated. Among these bacteria, only 70 could be serotyped with antisera given by Lab oratoire de Developpement et d'Analyses of Ploufragan (France). Identified serotypes were : O138 : K81, O139 : K82, O141 : K85ab, K88. The results of standard antibiograms showed strong resistance to several an tibiotics, certainly due to widespread misuse of antibiotics in Viet Nam. T hus, 100 % of these bacteria were resistant to Cefriaxone, Bactrim and Ceph alexin. 71.4 % were resistant to Colistin, 7.7 % responded to Kanamycin and 84.6 % to Gentamycin. Haemolysis was not a good indicator for research for E. coli responsible fo r edema disease in piglets, in Viet Nam.