How do high levels of ammonia resulting from poor ventilation affect the respiratory system during Coryza risk?
Answer
Irritating the respiratory mucous membranes, creating entry points for pathogens.
Poor ventilation creates environmental conditions that directly impair the bird's physical defenses against incoming microbes. Specifically, high concentrations of airborne irritants such as ammonia damage the delicate mucous membranes lining the respiratory tract. This irritation creates physical breaches or entry points, allowing the primary pathogen, *A. paragallinarum*, easier access to underlying tissues for colonization. Furthermore, compromised air quality reduces the bird's innate ability to efficiently clear inhaled debris and microbes, thereby exacerbating the vulnerability to establishment and subsequent proliferation of the infectious agent.
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