Mycoplasmosis in Geese: Chronic Respiratory Disease Explained

Mycoplasmosis is a contagious bacterial disease caused by Mycoplasma species, most often Mycoplasma gallisepticum (MG) in poultry and other birds. Geese can be affected, even though the disease is discussed more often in chickens and turkeys. In geese, it usually shows up as a chronic respiratory problem rather than a sudden severe illness.

These bacteria are unusual because they lack a normal cell wall. That matters because some common antibiotics do not work well against them, and because infected birds may improve without fully clearing the organism. A goose can look better after treatment but still remain a carrier, which means it may continue spreading infection to flockmates.

In many flocks, disease severity depends on the whole picture. A goose with mild MG exposure may have only occasional sneezing, while another bird under stress or dealing with a second infection may develop obvious sinus swelling, discharge, poor body condition, or breathing effort. That is why your vet will usually think about flock health, housing, and biosecurity along with the sick bird itself.

Mycoplasmosis in geese is usually caused by exposure to infected birds carrying Mycoplasma gallisepticum and, less commonly, other Mycoplasma species. Spread can happen horizontally through respiratory secretions, close contact, contaminated equipment, and shared airspace. In poultry systems, MG can also spread vertically from breeder birds through eggs.

Once introduced, the organism may move quietly through a flock before obvious illness appears. Merck notes that signs can stay latent for days to months, then spread more rapidly when birds are stressed. Overcrowding, poor ventilation, damp bedding, transport, temperature swings, and mixing age groups all increase the chance that infection becomes clinical.

Coinfections matter too. Viral or bacterial respiratory disease can damage the airways and make Mycoplasma problems worse. That is one reason your vet may recommend broader testing instead of treating based on discharge or sneezing alone. In backyard and mixed-species flocks, new arrivals, poultry swaps, and contact with other domestic or wild birds can all raise risk.

Diagnosis starts with a hands-on exam and flock history. Your vet will ask about how many birds are affected, when signs started, whether any new birds were added, housing conditions, egg production changes, and whether ducks, chickens, turkeys, or wild waterfowl share the space. Because several poultry diseases can look similar, history is a big part of sorting out the most likely causes.

Testing often includes PCR swabs, serology, and sometimes culture through a veterinary diagnostic laboratory. Merck lists bacterial isolation, serology, and molecular testing as common tools for detecting and characterizing MG. In some cases, your vet may also recommend necropsy of a recently deceased bird, especially if multiple birds are affected or the diagnosis is unclear.

Your vet may also want to rule out other causes of respiratory disease in geese, such as avian influenza, Newcastle-related disease concerns, aspergillosis, chlamydial infection, parasites, or secondary bacterial infections. That broader approach helps your pet parent decisions stay practical and safe, especially when flock health and biosecurity are involved.

Prevention focuses on biosecurity and flock sourcing. The most reliable protection is starting with birds from healthy, well-managed breeding programs. USDA APHIS notes that the National Poultry Improvement Plan covers Mycoplasma gallisepticum and applies to poultry, including waterfowl. If you are adding geese, ask about testing history and avoid bringing in birds with any respiratory signs.

Quarantine all new birds before they join the flock. A practical home plan is at least 2 to 4 weeks of separation, with dedicated boots, feeders, waterers, and hand hygiene. During quarantine, watch for sneezing, discharge, facial swelling, appetite changes, or reduced activity. Do not share crates, equipment, or water sources between groups unless they have been cleaned and disinfected.

Good daily management also lowers risk. Keep housing dry, reduce dust, improve airflow without direct chilling drafts, avoid overcrowding, and separate geese from sick poultry or birds of unknown health status. Stress reduction matters. Transport, breeding season pressure, sudden weather changes, and poor nutrition can all make carrier birds start shedding again.

If one goose develops respiratory signs, separate that bird promptly and contact your vet. Early testing helps protect the rest of the flock and can guide realistic next steps, whether that means supportive care, targeted treatment, or longer-term flock management decisions.