This study aimed to determine the dynamics of natural infection in the transmission of Babesia spp. to cattle in an enzootic instability area in Northeastern Brazil. Blood samples were collected from 30 calves located on two dairy farms to determine the packed cell volume (PCV) and the timing of the primo-infection using polymerase chain reaction (PCR) and their association with climatic factors and management practices. On Farm A, the determination of primo-infection was observed on average at 249.4 (±24.42) days of age for B. bigemina and at 252.6 (±17.07) days of age for B. bovis; there was no significant difference between the times of infection (P> 0.05). The infection coincided with a period of high rainfall in the region. On Farm B, primo-infection infection was not observed. There was no infection by Babesia spp. on Farm B due to the intensive use of acaricides that led to an absence of ticks. There was no significant difference between the average PCV of animals from Farms A and B (P> 0.05). The management practices on the properties, in addition to the weather conditions influenced the exposure of the animals to disease vectors and may have contributed to the maintenance of this enzootic area in Northeastern Brazil.
RESUMO.A cavidade oral é bastante acometida por neoplasias e corresponde ao quarto local mais frequente em pequenos animais. O melanoma é uma neoplasia maligna caracterizada com muita ou pouca produção de melanina, tendo o último um comportamento mais agressivo. O presente trabalho objetiva relatar o caso de um cão, macho, da raça Dachshund, de dois anos de idade que apresentava leve aumento da região infraorbitária e na cavidade oral uma massa de coloração avermelhada, com áreas enegrecidas, de consistência firme, localizada na região maxilar direita. O exame histopatológico sugeriu melanoma amelanótico. O paciente foi submetido a tratamento quimioterápico com carboplatina (300 mg/m², EV) a cada 3 semanas totalizando 3 sessões e corticoterapia com prednisolona (2,2 mg/kg, SID, VO) uso contínuo, seguido de 3 sessões de criocirurgia com intervalo de 15 dias. Devido à agressividade da neoplasia e o péssimo estado geral do animal, foi realizada a eutanásia seguida à necropsia, que constatou metástase em linfonodo submandibular direito. O melanoma amelanótico é frequentemente diagnosticado na clínica de pequenos animais, necessitando de mais estudos para desenvolvimento de tratamentos eficazes para este tipo de neoplasia. Palavras chave: Cavidade oral, neoplasia, melanoma, cãoOral amelanotic melanoma in young dog: Case report ABSTRACT. The oral cavity is severely affected by neoplasias and corresponds to the fourth most frequent site in small animals. Melanoma is a malignant neoplasm characterized with much or little production of melanin, the latter having a more aggressive behavior. The present work aims to report the case of a 2 year old dachshund male dog with a slight increase in the infraorbital region and in the oral cavity a mass of reddish color with blackish areas of firm consistency located in the region Right jaw Histopathologic examination suggested amelanotic melanoma. The patient underwent chemotherapy with carboplatin (300 mg / m², EV) every 3 weeks for 3 sessions and corticosteroid therapy with prednisolone (2.2 mg / kg, SID, VO) continuous use, followed by 3 sessions of cryosurgery with Interval of 15 days. Due to the aggressiveness of the neoplasia and the poor general state of the animal, euthanasia followed by necropsy, which revealed metastasis in the right submandibular lymph node. Amelanotic melanoma is frequently diagnosed in the small
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