Avian mycoplasma and pathogenicity--a review

Area of Science:

• Veterinary Microbiology
• Avian Pathology

Background:

• Mycoplasma gallisepticum, Mycoplasma synoviae, and Mycoplasma meleagridis are significant avian pathogens.
• These mycoplasmas cause respiratory and systemic diseases in chickens and turkeys.

Purpose of the Study:

• To describe the affected tissues and lesions caused by these avian mycoplasma strains.
• To analyze factors influencing disease production, including host age and infection route.
• To discuss the pathogenesis mechanisms and virulence determination methods.

Main Methods:

• Descriptive analysis of affected tissues and observed lesions.
• Consideration of host-related factors (age, immune status) and pathogen-related factors (virulence, inoculum size).
• Review of established and potential methods for virulence assessment.

Main Results:

• Specific tissues and lesions associated with M. gallisepticum, M. synoviae, and M. meleagridis infections detailed.
• Identified key factors influencing disease severity and outcome.
• Pathogenesis mechanisms outlined, with a focus on virulence factors.

Conclusions:

• Understanding the pathogenesis of these avian mycoplasmas is crucial for disease control.
• Virulence determination methods are essential for risk assessment and management strategies.
• Integrated approaches considering host and pathogen factors are needed for effective avian mycoplasma management.