Klebsiella oxytoca as a cause of equine abortion–short communication.

The research article reveals that the bacterium Klebsiella oxytoca resulted in the abortion of a horse’s fetus at the tenth month of pregnancy.

Description of the Case

• The bacterium, naming Klebsiella oxytoca, is highlighted as the causative agent behind the abortion of a female equine fetus in its 10th month of pregnancy. Post-abortion, the bacteria were grown from the liver, lung, and stomach content, signifying the pathogen’s significant presence within the horse’s system.

Microscopic Findings

• The bacteria were tagged using an anti-Mycobacterium bovis antibody in the thymus, liver, and lungs of the horse’s body. The researchers associated the presence of this antibody with the bacterium as it is effective in identifying and binding to bacterial cells. Additionally, the bacteria in the thymus and lungs were stained with Giemsa and Brown-Brenn staining, which helped in making the bacteria more visible under the microscope.

Post-Mortem Examination

• The researchers found the horse’s lungs to be diffusely consolidated post-mortem, with numerous spots measuring 2-4 mm in diameter present. These observations correlate with severe pyogranulomatous pneumonia, suggesting substantial respiratory insults.
• At a closer microscopic look, the researchers saw numerous intraalveolar neutrophils and macrophages, along with Langhans’ giant cells – an instance observed in granulomatous conditions.
• The detection of K. oxytoca was in the cytoplasm of these cells and extracellularly in the alveoli, bronchioles, and bronchi’s lumen, the thymus’ capsule, and the liver’s sinusoids, indicating widespread bacterial invasion.

Significance of Findings

• The data indicates that Klebsiella oxytoca can lead to abortions in horses at random, solidifying the pathogenic role of this bacterium.
• The case also submits that K. oxytoca can be both intracellularly and extracellularly pervasive, which may significantly contribute to the severity of the resulting conditions in infected horses.