Avian bordetellosis is a contagious upper respiratory tract disease seen most often in young turkeys and caused mainly by Bordetella avium (and less commonly Bordetella hinzii). Flocks can show high morbidity with typically low mortality in uncomplicated cases, but growth setbacks and secondary infections can increase losses in commercial settings. 

What is Bordetella bronchitis and why can it linger on farms?

After exposure, bacteria attach to the ciliated epithelium of the upper airway and can damage the tracheal lining. Many birds recover over weeks, but older birds can remain clinically inapparent carriers that help maintain infection pressure for the next susceptible group. Co exposure to other respiratory pathogens or irritants can worsen clinical expression and complicate flock level outcomes. 

How do birds get infected?

Transmission is mainly bird to bird through respiratory secretions and close contact, with rapid spread favored by shared air space, high stocking density, and mixing of age groups. The organism can move between barns and farms via people, equipment, and transport logistics when hygiene is inconsistent, so operational biosecurity matters as much as treatment decisions. 

Clinical signs

Clinical signs are usually respiratory and often start abruptly in young turkeys: sneezing (“snick”), watery or foamy eyes, nasal discharge (sometimes expressed by gentle pressure on the nares), mouth breathing, dyspnea, tracheal rales, and altered vocalization. Appetite and activity may drop, and performance losses can follow even when mortality remains low. Because signs overlap with infectious bronchitis, Newcastle disease, colibacillosis, and other common respiratory problems, flock context and targeted testing guide decisions. 

Diagnosis is typically based on flock history plus confirmation from respiratory tract sampling. Culture can be challenging because faster growing bacteria may overgrow some specimens; targeted sampling and molecular detection can help when quick, specific confirmation is needed for barn level decisions. 

When avian Bordetella bronchitis is on the differential list, rapid confirmation helps you separate it from viral bronchitis patterns and tighten containment. Vitrosens Biotechnology’s VetFor molecular workflow includes the Bordetella Bronchitis Detection Kit (VVA08), a PCR based option designed to support laboratory detection from appropriate respiratory specimens, enabling faster, standardized reporting to guide isolation, barn level hygiene actions, and follow up surveillance.

Treatment and supportive care

Antimicrobial treatment during outbreaks is reported to be rarely effective, so management focuses on reducing impact: improve ventilation, reduce ammonia and dust, minimize handling stress, and control secondary invaders when clinically indicated under veterinary supervision. 

Prevention and control

Vaccines may lessen clinical severity but are not expected to prevent infection, so prevention relies on biosecurity, rigorous cleanup and disinfection after outbreaks, optimal air quality, and sound husbandry with good brooding management and reduced crowding. 

References

Merck Veterinary Manual. Bordetellosis in Poultry (Turkey Coryza, Bordetella avium Rhinotracheitis).
Register KB et al. Analytical Verification of a PCR Assay for Identification of Bordetella avium.
AAAP. Avian Disease Manual: Bordetellosis (Turkey Coryza; Bordetella avium).