Actinobacillosis outbreak in cattle with clinical manifestation of hippopotamus-like face

Abstract

Actinobacillosis outbreak with clinical manifestation of hippopotamus-like face observed in a property located in the municipality of Capão do Leão, Southern Brazil, in September 2016, is described. The cattle herd remained for most of the year in rice stubble. When these areas were occupied with new crops, they were transferred to areas where there were small native forests. Three cattle were affected. They presented a volume increase in the nasolabial and maxillary region, and there was also regional lymph node swelling. The evolution of the disease occurred in approximately six months. In tissue fragments collected for culture, Actinobacillus lignieresii was isolated. The diagnosis was based on clinical findings, histopathological evaluation characterized by the presence of piogranulomas with Splendore Hoepli reaction in its center, bacterial isolation, and identification of A. lignieresii by polymerase chain reaction (PRC) and genetic sequencing.

Infection Due to Actinobacillus lignieresii in Cattle with Brain and Ocular Involvement: Histological and Microbiological Features

“…Some authors have drawn attention to the importance of molecular diagnosis for the identification of A. lignieresii, especially in atypical cases of the disease [14]. Scheid et al [14] found that actinobacillosis with hippopotamus-like face clinical manifestation, although unusual, occurs with epidemiological conditions similar to the other forms of the disease and that the route of entry of the agent into the infection may be determinant in its clinical manifestation.…”