The presumptive colonies were selected and according to the method of Ewing (1986), the biochemical tests were conducted. A serological test was performed to react with Salmonella O antiserum (Difco). Colonies showing typical agglutination by O antiserum were serotyped with Salmonella H antiserum (Difco) according to Difco Laboratories (1977). In the case of a biphasic organism, it was finally serotyped with a phase-changing test according to the method of Collins and Lyne (1984).