gram-negative,pleomorphic,aerobic coccobacillus.

B. pertussis, a strict human pathogen, is the etiologic agent of whooping cough, a highly contagious respiratory disease marked by severe, spasmodic coughing episodes.B. parapertussiscauses a milder form of whooping cough in human beings and chronic, nonprogressive pneumonia in sheep.B. bronchisepticacauses chronic respiratory infections in a wide range of animals.

Bacteria; Proteobacteria; Betaproteobacteria; Burkholderiales; Alcaligenaceae; Bordetella