Porcine Mycoplasma hyosynoviae Arthritis – NAVLE Study Guide
Overview and Clinical Importance
Mycoplasma hyosynoviae is a major cause of infectious arthritis in growing-finishing pigs and replacement breeding stock. This ubiquitous organism colonizes the upper respiratory tract and tonsils of pigs, spreading hematogenously to cause a non-suppurative polyarthritis. Understanding this disease is essential for NAVLE preparation as it represents a common differential diagnosis for lameness in swine production.
Unlike Mycoplasma hyorhinis which primarily affects younger pigs (3-10 weeks), M. hyosynoviae targets pigs weighing 35-115 kg (approximately 10-24 weeks of age). This age distinction is a critical point for NAVLE examination questions.
Etiology
Mycoplasma hyosynoviae is a small, cell wall-deficient bacterium belonging to the class Mollicutes. Key characteristics include:
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