FIG 2: Superficial necrosis associated with a fibrin exudate (arrow) in the colon of a wild pig with enterocolitic salmonellosis. Haematoxylin and eosin. x 100 S enterica was isolated from samples of affected areas of the large intestine submitted for microbiological analysis. Typification of this isolate, performed at the Oswaldo Cruz Institute, showed it to be of the Saintpaul serovar. No pathogenic bacteria were isolated from the spleen, mesenteric lymph nodes, liver or lung submitted for bacteriology. According to Barker and others (1993) and Schwartz (1999), bacteria do not usually spread to the mesenteric lymph nodes in cases of the enteric form of salmonellosis, and the inflammation is restricted to the intestine. Infection with Salmonella Saintpaul and isolation of the serovar have been reported in human beings (Taylor and others 2000), camels (Wernery 1992), horses (Hird and others 1984), sheep (McInnes 1971) and turkeys (Baggesen and others 1996). Langenegger and others (1983) have identified S Saintpaul in Brazil and other Latin American countries, where it constituted 2·08 per cent of the Salmonella serovars isolated. However, these reports were based on isolation and typification only, with no characterisation of lesions. Sections of affected areas of the small and large intestines were stained immunohistochemically using monoclonal antibody specific for Brachyspira species (Fisher and others 1997) or polyclonal antibody specific for Lawsonia intracellularis (Guedes and Gebhart 2003). In addition, DNA was extracted from three 5 μm sections of four different paraffin blocks of intestinal lesions representative of those described above for PCR. The primers used targeted the Clostridium perfringens type C toxin genes (Buogo and others 1995). PCR and immunohistochemistry were negative for the tested samples. Based on these results, it seems unlikely that these enteropathogenic agents were involved in the pathological process. Poultry and other small wild birds are possible sources of Salmonella infections for human beings and domestic animal species. Epidemiological investigations have shown the Outbreak of enterocolitic salmonellosis on a wild pig farm