ResumoO objetivo deste trabalho foi descrever dois surtos de dermatofilose em bezerros da raça Nelore no Estado de Mato Grosso do Sul com características epidemiológicas peculiares à região Centro-Oeste. As taxas de morbidade e letalidade foram de 50% e 0,0025% no surto 1 e, 12,5% e 10% no surto 2, respectivamente. Apenas bezerros da raça Nelore com idade entre 5 e 60 dias foram afetados. A maioria dos casos ocorreu em pastagens de Brachiaria brizantha durante o período chuvoso do ano. Nos dois surtos, os sinais se iniciavam com espessamento da pele, seguido por lacrimejamento e formação de crostas ao redor dos olhos e focinho. Nos casos mais graves, as lesões disseminavam-se pela face e por todo o corpo, evoluindo para acentuado espessamento generalizado da pele, com formação de dobras. As lesões de pele caracterizaram-se, histopatologicamente, por dermatite supurativa e hiperqueratose. O diagnóstico foi confirmado pela visualização de estruturas basofílicas filamentosas morfologicamente compatíveis com Dermatophilus congolensis em esfregaços corados por Gram. Os tratamentos com estreptomicina, oxitetraciclina ou penicilina associada à estreptomicina utilizados nos bezerros demonstraram ser eficientes. A doença foi confundida pelos produtores com fotossensibilização hepatógena causada por ingestão de Brachiaria spp. Este artigo discute estes resultados com vistas a auxiliar o diagnóstico correto da dermatofilose que é importante para a realização do tratamento adequado e de medidas de controle eficazes, minimizando as perdas causadas por esta doença. Palavras-chave: Dermatophilus congolensis, dermatite, Brachiaria brizantha, bovinos AbstractThe objective of this study was to describe two outbreaks of dermatophilosis in Nelore calves in the State of Mato Grosso do Sul with epidemiological characteristics peculiar to the Midwest. Morbidity and mortality rates were 50% and 0.0025% in the outbreak 1, and 12.5% and 10% in the outbreak 2, respectively. Only Nelore calves aging between 5 and 60 days were affected. Most cases occurred on pastures of Brachiaria brizantha during the rainy season. In both outbreaks, the signs started with skin thickening followed by weeping and crusting around the eyes and muzzle. In more severe cases, lesions disseminated throughout the face and the body, evolving to generalized marked thickening of the skin and wrinkling. Histology of skin lesions showed suppurative dermatitis and hyperkeratosis. The diagnosis was confirmed by viewing basophilic filamentous structures morphologically consistent with Dermatophilus congolensis in Gram stained smears. The treatment with streptomycin, oxytetracycline or penicillin associated with streptomycin used in calves demonstrated to be effective. The disease has been misdiagnosed, by the farmers, with hepatic photosensitization caused by Brachiaria spp. ingestion.
RESUMO.O mastocitoma é o tumor cutâneo que mais acomete os cães. A citopatologia é um exame que tem por finalidade diferir processos infecciosos de processos neoplásicos. A histopatologia diferencia os mastocitomas em diferentes graus. No entanto, há a necessidade de uma padronização do exame citopatológico para a diferenciação dos mastocitomas em benignos ou malignos. Este trabalho teve como objetivo demonstrar a capacidade de diferenciação de mastocitomas benignos e malignos pelo exame citopatológico, comparando com o resultado da histopatologia. Foram utilizados 19 cães com nódulos cutâneos, diagnosticados com mastocitoma. As lâminas citológicas e histológicas foram avaliadas separadamente para não haver influência no diagnóstico. O exame citológico demonstrou ser capaz de demonstrar diferentes graus de malignidade, limitando-se aos critérios nucleares e de invasividade.Palavras chave: câncer, granulação citoplasmática, mastócito Cytological classification of malignancy of mastocytomas in dogsABSTRACT. Mastocytoma is the cutaneous tumor that affects most dogs. Cytopathology is an examination that aims to defer infectious processes of neoplastic processes. Histopathology differentiates mastocytomas in different degrees. However, there is a need for a standardized cytopathological examination for the differentiation of mastocytomas into benign or malignant ones. The objective of this study was to demonstrate the capacity of differentiation of benign and malignant mastocytomas by cytopathological examination, comparing with the histopathology result. We used 19 dogs with cutaneous nodules, diagnosed with mastocytoma. Cytological and histological slides were evaluated separately for no influence on diagnosis. The cytological examination demonstrated to be able to demonstrate different degrees of malignancy, being limited to the nuclear criteria and of invasiveness. Keywords: cancer, cytoplasmic granulation, mastocyteClasificación citológica de malignidad de mastocitomas en perros RESUMEN. El mastocitoma es el tumor cutáneo que afecta con frecuencia a los perros. La citopatología es un examen que tiene por finalidad diferir procesos infecciosos de procesos neoplásicos. La histopatología particulariza los mastocitomas en diferentes grados. Sin embargo, hay la necesidad de una estandarización del examen citopatológico
Introduction: An early and accurate diagnosis of septicemic salmonellosis is critical for implementing timely and proper treatment, prevention, and control measures. Methodology: Here, we report a study on three outbreaks of septicemic salmonellosis in calves from Midwestern Brazil. Results: the morbidity, mortality and lethality rates were of 10.55%, 2.79%, and 26.4%, respectively. Higher susceptibility was detected in Bos taurus than in Bos indicus cattle. Clinical manifestations consisted of apathy, hyperthermia, difficulty breathing and panting, and pallor of the mucous membranes. Chronic cases had necrosis of the tail tip and ears. Gross findings included enlarged liver, non-collapsed edematous lungs and diphtheritic enteritis. Significant histopathological changes included paratyphoid nodules in the liver and acute interstitial pneumonia. Salmonella enterica subsp. enterica serotype Dublin was detected by culture and by PCR from the blood of live calves, and from the spleen, liver, bile, mesenteric lymph node and lung samples of necropsied calves. Conclusions: We suggest that in clinical cases of septicemic salmonellosis, blood samples are better than fecal samples for detection of the agent, being a sound test to identify animal carriers in the herd.
Pesq. Vet. Bras. 32(8) Canids are the main hosts of Neospora caninum, but cattle, (sheep, goats and horses may serve as intermediary hosts. N. caninum infection of pregnant intermediary hosts may provoke abortion and neonatal infections. This study is the ϐirst to report lamb abortion associated with N. caninum in Mato Grosso do Sul. Epidemiological data were obtained from interviews with sheep producers. For microscopic examination, fragments of different organs removed from 4 sheep fetuses, aborted and necropsied, were ϐixed in 10% formaldehyde, embedded in parafϐin and subjected to the hematoxylin-eosin staining protocol and immunohistochemistry (IHC) to test for N. caninum and Toxoplasma gondii. The abortion outbreak studied was reported from a herd of 268 Santa Inês sheep (including 186 pregnant ewes), with 10 abortion cases in the last third of gestation. Four fetuses were examined, 3 from a same ewe. At necropsy, one fetus exhibited crackling in the lung and all its organs were reddish. Histological ϐindings detected mononuclear cell inϐiltrates among myocardium ϐibers and around blood vessels, in addition to circular structures with basophilic points resembling protozoans. IHC tests revealed strongly positive staining for N. caninum and weakly positive for T. gondii, characterizing N. caninum infection.
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