Which factor is considered a predisposing cause influencing Coryza expression severity?

Answer

Stress leading to compromised respiratory immune defenses

While the presence of *A. paragallinarum* is necessary for Infectious Coryza, the expression and noticeable severity of an outbreak across a flock are heavily influenced by environmental stressors. These stressors do not initiate the infection but act as predisposing causes, creating ideal conditions for the bacteria to rapidly proliferate and spread. Physical duress experienced by poultry leads to the compromise of natural immune defenses located within the respiratory tract. This weakening makes the host significantly more vulnerable to colonization and active infection by the *A. paragallinarum* bacteria already present in the environment, leading to pronounced clinical signs where they might otherwise remain subclinical.

Which factor is considered a predisposing cause influencing Coryza expression severity?

Related Questions

What bacterium is the principal pathogen responsible for Infectious Coryza?What was *Avibacterium paragallinarum* previously known as in older literature?Which factor is considered a predisposing cause influencing Coryza expression severity?How do high levels of ammonia resulting from poor ventilation affect the respiratory system during Coryza risk?Which agents frequently co-infect birds alongside *A. paragallinarum* causing a more severe syndrome?What is the primary route for *A. paragallinarum* transmission between chickens in a commercial flock?What limits the effectiveness of an Infectious Coryza vaccine regarding *A. paragallinarum* serogroups?How do farm personnel mechanically contribute to the indirect spread of Coryza across a farm?What tell-tale signs signal a flock is likely dealing with coryza upon initial observation?What rigorous environmental assessment should a flock manager prioritize to minimize future IC outbreaks beyond medication?
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