Streptococcus zooepidemicus infection in sheep

Area of Science:

• Veterinary Pathology
• Bacteriology
• Sheep Diseases

Background:

• Streptococcus zooepidemicus is a known pathogen in various animal species.
• The specific pathological effects of S. zooepidemicus in sheep, particularly causing fibrinous inflammation, require further elucidation.

Purpose of the Study:

• To investigate the pathological findings associated with Streptococcus zooepidemicus infection in sheep.
• To reproduce and confirm the pathogenicity of S. zooepidemicus in experimentally infected lambs.

Main Methods:

• Observation of clinical signs and post-mortem lesions in naturally infected lambs.
• Intratracheal inoculation of Streptococcus zooepidemicus into healthy lambs to reproduce the disease.
• Histological examination of affected tissues, including lungs, pleura, and pericardium.

Main Results:

• Naturally occurring cases showed fibrinous pericarditis, pleuritis, and pneumonia linked to S. zooepidemicus.
• Experimental infection successfully reproduced the observed clinical signs and pathological lesions.
• Histopathology revealed acute inflammation in bronchioles and alveoli, alongside fibrinous pleuritis and pericarditis.

Conclusions:

• Streptococcus zooepidemicus is capable of causing severe, acute, and often fatal fibrinous inflammatory disease in sheep.
• The study confirms the role of S. zooepidemicus in ovine respiratory and systemic infections, highlighting its pathogenic potential.