Porcine Bordetella bronchiseptica Infection Study Guide

Overview and Clinical Importance

Bordetella bronchiseptica is a gram-negative, aerobic coccobacillus that is ubiquitous in swine populations worldwide. It is a primary respiratory pathogen causing rhinitis, tracheitis, bronchitis, and pneumonia. While B. bronchiseptica alone typically causes mild, self-limiting disease (nonprogressive atrophic rhinitis), its clinical significance dramatically increases when combined with toxigenic Pasteurella multocida, leading to progressive atrophic rhinitis (PAR) - a severe and economically devastating condition.

B. bronchiseptica also serves as a key contributor to the Porcine Respiratory Disease Complex (PRDC), predisposing pigs to secondary bacterial infections with Streptococcus suis, Haemophilus parasuis, and Pasteurella multocida, and exacerbating viral infections including PRRSV and swine influenza virus.

Etiology

Organism Characteristics

Bordetella bronchiseptica is a small, gram-negative, aerobic coccobacillus belonging to the genus Bordetella. It is closely related to B. pertussis (causative agent of whooping cough in humans) but has a broader host range including swine, dogs, cats, rabbits, and occasionally humans.