Merck Manual

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Photomicrograph of Avibacterium paragallinarum after culture of a sample on blood agar
Photomicrograph of  <i >Avibacterium paragallinarum</i> after culture of a sample on blood agar
Photomicrograph of Avibacterium paragallinarum after culture of a sample on blood agar

The causative bacterium of infectious coryza is A paragallinarum, a gram-negative, pleomorphic, nonmotile, catalase-negative, microaerophilic rod.

Courtesy of Dr. E. Soriano-Vargas.