Mycoplasma felis as a cause of pleuritis in horses.
1983
Mycoplasma felis was the only organism recovered from the thoracic cavity of a horse with pleuritis. Large numbers of mildly degenerative neutrophils were in the pleural fluid. The horse developed a serologic response to M felis and recovered during hospitalization. Experimentally, a pony was inoculated in the thoracic cavity with a pure culture of the M felis isolate suspended in the pony's serum. A control pony was inoculated with serum only. Within 48 hours, the principal pony developed fever, increased respiratory rate, pleural effusion, and signs of pain. A highly cellular exudate with nondegenerative neutrophils and large numbers of M felis was recovered from the thoracic cavity. The control pony remained normal. The principal pony developed an antibody response to M felis. The control pony did not. Fourteen days after inoculation, both ponies were euthanatized. Necropsy revealed pleural inflammation in the principal pony. Pleural lesions were not found in the control pony.
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