Ovine pulmonary cytomegalovirus.

Area of Science:

• Veterinary Pathology
• Virology
• Sheep Medicine

Background:

• Pneumonia is a significant respiratory disease in weaned lambs.
• Mycoplasma ovipneumoniae is a common bacterial cause of pneumonia in sheep.
• Cytomegalic cells with intranuclear inclusions can indicate viral infections.

Observation:

• Cytomegalic cells featuring intranuclear inclusions were observed in the lung tissue of a lamb.
• The lamb also presented with pneumonia and Mycoplasma ovipneumoniae infection.
• Microscopic examination revealed viral particles within the inclusions.

Findings:

• Light and electron microscopy confirmed a cytomegalovirus infection.
• The morphology of the viral particles was consistent with herpesviruses.
• This suggests a co-infection or a secondary viral complication in the lamb.

Implications:

• This finding highlights the potential for cytomegalovirus to cause disease in sheep.
• It underscores the importance of considering viral etiologies in ovine pneumonia.
• Further research may elucidate the role of cytomegalovirus in Mycoplasma ovipneumoniae-associated respiratory disease in lambs.