Salmonelose Septicêmica em bezerros com idade entre 60 e 90 dias - relato de caso

Abstract

The septicemic salmonellosis in cattle is an infectious disease caused by several serotypes of Salmonella sp., with the serotype Salmonella Dublin most commonly isolated in outbreaks of the disease. It mainly affects calves at two months of age, but there are few reports of natural infection in calves with 60 to 90 days of life. Affected animals may develop fever, apathy, anorexia, dyspnea, pneumonia, arthritis, meningitis, necrosis of the extremities, bloody diarrhea and sudden death. During an outbreak of mortality in calves between 60 and 90 days of age, of eight animals affected with fever, lethargy, lack of appetite, petechial hemorrhages and congestion of the mucous membranes, tachycardia and tachypnea intense, four died in three days after onset of symptoms. Clinical examination of all sick animals, harvest of blood and serum for hemogram and biochemical profile, hemoparasites research and necropsy of animals that died was performed. Leptospira sp. was researched by culture, dark-field microscopy and microscopic agglutination test. Bacterial culture was conducted for isolation of enterobacteria, PCR to confirm the genus Salmonella and search virulence factors for E. coli. Enterobacteria Laboratory of Oswaldo Cruz Institute (IOC / FIOCRUZ - RJ) performed serotyping of genres found. After a month samples of water, feed, milk replacer and sand beds were collected to research sources of infection and the presence of carrier animals for S. Dublin in the herd, but all samples were negative for bacterial culture. Isolation and characterization of S. Dublin samples from the four animals necropsied in association with clinical signs and results of laboratory tests, especially the differential diagnoses, feature a case of septicemic salmonellosis by that agent. After treatment with florfenicol 20 mg / kg of body weight, the other four affected animals recovered. Metaphylaxis with florfenicol 10 mg / kg of body weight by milk was held to the other animals, not observing further clinical cases. The theoretical knowledge combined with systematic work methodology are essential for the diagnosis, treatment and control of septicemic salmonellosis in calves.