Brucellosis and Q fever, two zoonoses, are important causes of abortion in ruminants, as well as economically significant diseases caused by a gram-negative bacterium. Determination of these diseases is therefore of great importance. In this study, the organs of 35 naturally infected and aborted ovine fetuses were examined for the presence of changes resulting from infections by Brucella melitensis and Coxiella burnetii, according to macroscopic, bacteriological, histopathological and immunohistochemical methods. B. melitensis was observed in 21 cases, and C. burnetii was observed in 8 cases of the aborted ovine fetuses, and these were determined with immunohistochemical methods. Brucellosis was observed in 18 of the aborted ovine fetuses, and this was determined by microbiological methods. Negative (-) results were found for all of the other fetuses. The Brucella antigen was determined to be localized as intracytoplasmic in mainly alveolar macrophages, bronchi, bronchioles, glandular epithelial cells around bronchial glands, neutrophils, hepatocytes and Kupffer cells. The Coxiella antigen was found to be localized in the alveolar macrophages in the lungs, bronchi, bronchioles and alveolus, and in the cytoplasms of bronchial gland epithelial cells, and in the cytoplasms of hepatocytes and Kupffer cells in the liver. Immunohistochemical and microbiological diagnoses of brucellosis and coxiellosis were compared; it was concluded that immunohistochemical methods were more safely applied than microbiological methods.
This study determined the presence of nitric oxide synthesis isoforms (nNOS, iNOS, and eNOS) in thoracic spinal cord segments and nodose ganglia of rats with gamma-irradiated livers.
Material and Methods
Male rats (n = 32) were divided into equal groups A, B, C, and D. In group A, the controls, no radiation was applied, while groups B, C, and D received 10 Gy of ionising gamma radiation. The rats of group B were euthanized at the end of the first day (d1), those of group C on the second day (d2), and those of group D on the third day (d3). The liver, spinal cord segments, and nodose ganglion tissues were dissected and fixed, and the liver sections were examined histopathologically. The other tissues were observed through a light microscope.
Regeneration occurred at the end of d3 in hepatocytes which were radiation-damaged at the end of d1 and d2. On d1, some nNOS-positive staining was found in the neuronal cells of laminae I–III of the spinal cord and in neurons of the nodose ganglion, and on d3, some staining was observed in lamina X of the spinal cord, while none of note was in the nodose ganglion. Dense iNOS-positive staining was seen on d1 in the ependymal cells of the spinal cord and in the glial cells of the nodose ganglion, and on d3, there was still considerable iNOS staining in both tissues. There was clear eNOS-positive staining in the capillary endothelial cells of the spinal cord and light diffuse cytoplasmic staining in the neurons of the nodose ganglion on d1, and on d3, intense eNOS-positive staining was visible in several endothelial cells of the spinal cord, while light nuclear staining was recognised in the neurons of the nodose ganglion.
The nNOS, iNOS, and eNOS isoforms are activated in the spinal cord and nodose ganglion of rats after ionising radiation insult to the liver.
Introduction: The aim of this study was to determine the predisposing effect of bovine respiratory syncytial virus (BRSV) on Pasteurella spp. infection in naturally-induced pneumonia in cattle by immunohistochemical labelling.
Material and Methods: Lungs of cattle slaughtered in the slaughterhouse were examined macroscopically, and 100 pneumonic samples were taken. The samples were fixed in 10% neutral formalin and embedded in paraffin by routine methods. Sections 5 μm in thickness were cut. The streptavidin-peroxidase method (ABC) was used to stain the sections for immuno-histochemical examination.
Results: BRSV antigens were found in the cytoplasm of epithelial cells of bronchi, bronchioles, and alveoles and within inflammatory cell debris and inflammatory exudate in bronchial lumens. Pasteurella spp. antigens were detected in the cytoplasm of the epithelial cells of bronchi and bronchioles, and in cells in the lumens of bronchi and bronchioles. Eleven cases were positive for only one pathogen (six for BRSV and five for Pasteurella spp.), while 35 cases were positive for 2 pathogens: BRSV plus P. multocida (n = 21) or M. haemolytica (n = 14).
Conclusion: The presence of high levels of BRSV in dual infections indicates that BSRV may be the main pneumonia-inducing agent and an important predisposing factor for the formation of Pasteurella spp. infections in cattle naturally afflicted with pneumonia.