EN
"Coli septicaemia" causes large losses in the breeding of chicks, broilers, and turkeys. It has been shown that the most frequent causes of this disease are the serotypes O2:K1, O78:K80, O1:K1. O8:K? (1, 2, 4, 5, 20). The purpose of this work was a closer definition of the antigen structure of smooth and rough forms frmn serotypes O2:K1 and O78:K80, coliform bacilli, with the help of immunoelectrophoresis and passive hemagglutination, as well as examination of the comrposition of simple sugars (monosaccharides) in extracts obtained from the above mentioned serotypes.