Respiratory Colibacillosis in Geese: E. coli Air Sac and Lung Infection

Respiratory colibacillosis is a bacterial disease caused by certain strains of Escherichia coli. In geese and other poultry, these bacteria can infect the air sacs and sometimes the lungs, leading to airsacculitis and pneumonia-like illness. In more serious cases, the infection can extend beyond the respiratory tract and cause inflammation around the heart and liver or even septicemia.

This condition is often not a simple "caught a germ" problem. E. coli is commonly present in the environment and feces, but disease tends to happen when birds are stressed, exposed to heavy contamination, or already dealing with another respiratory challenge. That is why a goose with respiratory colibacillosis may also have a history of poor air quality, wet litter, overcrowding, transport stress, or another infectious disease in the flock.

For pet parents, the most important point is that breathing trouble in a goose is always urgent. Affected birds may hide illness until they are quite sick. Early veterinary care gives your vet more options, including supportive care, flock-level management changes, and targeted treatment based on testing.

Respiratory colibacillosis develops when disease-causing avian strains of E. coli gain access to the respiratory tract or spread internally after another problem weakens normal defenses. In poultry, airsacculitis is a classic lesion of colibacillosis. The bacteria may enter through inhalation of contaminated dust or droplets, or they may take advantage of tissue already irritated by another infection or by poor environmental conditions.

Common risk factors include wet litter, high ammonia, dust, poor ventilation, unsanitary water systems, crowding, chilling, heat stress, and heavy fecal contamination. These conditions damage the respiratory tract and increase bacterial exposure. Rodents, insects, dirty equipment, and inadequate downtime between groups of birds can also contribute to spread.

In many flocks, E. coli acts as an opportunistic or secondary pathogen. That means your vet may also look for other respiratory diseases or stressors that set the stage for infection. Treating the sick bird matters, but correcting the underlying housing and flock-management problem is often what prevents repeat cases.

Your vet will start with the history, flock pattern, and physical exam. They will want to know how many birds are affected, how quickly signs started, whether there have been recent weather or housing changes, and whether any birds have died. Because respiratory signs in geese can overlap with viral, fungal, mycoplasmal, and other bacterial diseases, diagnosis should not rely on symptoms alone.

Definitive diagnosis usually involves finding lesions that fit colibacillosis and then isolating a pure culture of E. coli from affected tissues or lesions. In practice, that often means necropsy of a freshly deceased bird, sampling of air sac or internal lesions, and bacterial culture. Your vet may also recommend antimicrobial susceptibility testing, because avian E. coli isolates are often resistant to multiple drugs.

Depending on the case, additional testing may include cytology, bloodwork in valuable individual birds, radiographs, or testing for underlying respiratory diseases. If several geese are ill, flock-level investigation is especially important. A diagnosis that only names E. coli but misses the ventilation, sanitation, or coinfection problem may not stop the outbreak.

Prevention focuses on lowering bacterial exposure and protecting the respiratory tract. Keep bedding clean and dry, improve ventilation, and reduce dust and ammonia buildup. Water systems should be cleaned regularly, because contaminated drinkers and water lines can help spread bacteria. Feed should stay dry and protected from fecal contamination, rodents, and wild birds.

Good flock management matters as much as sanitation. Avoid overcrowding, reduce sudden temperature stress, and quarantine new birds before mixing them with the flock. If your geese share space with other poultry, ask your vet whether another species could be carrying a respiratory problem that is setting up secondary E. coli infection.

If respiratory disease has happened before, work with your vet on a flock-level prevention plan. That may include reviewing airflow, litter management, pest control, water hygiene, and how dead birds are handled and submitted for testing. Because avian E. coli can be drug resistant, prevention is often more reliable than repeated medication use.