Which agents can initiate infection or worsen Coryza after *A. paragallinarum* compromises defenses?
Answer
*Mycoplasma gallisepticum* or *Pasteurella multocida*
The progression of Infectious Coryza is often complicated by secondary or concurrent bacterial challenges. While *A. paragallinarum* is the specific cause of true Coryza, the initial damage it inflicts on the respiratory mucosa opens the door for other bacterial pathogens to establish themselves or exacerbate the existing infection. Specifically, *Mycoplasma gallisepticum* and *Pasteurella multocida* are noted as agents that can either begin the respiratory breakdown or worsen the clinical presentation once the primary infection has initiated inflammation and tissue damage.
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