Ornithobacterium is a genus of Gram-negative, microaerophilic, rod-shaped bacteria from the family Weeksellaceae (formerly Flavobacteriaceae.[2]).

It comprises two known species, O. hominis and O. rhinotracheale.

Both species inhabit the respiratory tract: O. hominis is found in the human nasopharynx[3] and O. rhinotracheale in the trachea of wild and domesticated birds[4]

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