a study on the clinical features of salmonellosis and prevalence of salmonella serogroups in calves

the clinical features of salmonellosis and prevalence of salmonella serogroups in calves were studied on one hundred and thirty two suspected calves in dairy farms around tehran. clinical examinations were carried out and the faecal or tissue (if calve was euthanized or dead) samples were collected for bacterial culture. the results were analyzed with chi-square statistical test. salmonella spp was isolated from 18 samples of 132(13.6%). salmonella isolates belonged to 4 serogroups d, b, cl and c2. clinical signs observed in 6 forms: chronic entritis(33.3%), septicemia(27.8%), acute enteritis(22 %), dry gangrene of exterimities( 5.5 % ), pneumoenteritis( 5.5 % ) and polyarthritis( 5.5 % ). eight of 18 salmonelleic calves (44.4%) died and 7 (38.9%) euthanized because of prolonging disease and not response to treatment. occurrence of salmonellosis was signifiantly higher in calves with 1.5 to 3 month of ages (p