Avian Cholera in Geese: Pasteurella Infection Symptoms and Response

Avian cholera, also called fowl cholera, is a contagious bacterial disease caused by Pasteurella multocida. It affects many bird species, but waterfowl like geese are especially important in outbreaks. In geese, the disease may appear as sudden death with little warning, or as a more drawn-out illness with weakness, diarrhea, mouth discharge, and breathing changes.

This disease can move quickly through a group of birds. In acute cases, a pet parent may first notice one or more dead geese with no clear earlier symptoms. In birds that survive longer, infection can spread through the bloodstream and damage organs such as the liver, spleen, heart coverings, and airways.

Avian cholera is also a flock health problem, not only an individual bird problem. That means your vet may focus on the whole group, housing, water sources, and recent exposure to wild birds when deciding what testing and response steps make sense.

Avian cholera is caused by the bacterium Pasteurella multocida. The organism can spread between birds through contaminated water, secretions, droppings, carcasses, equipment, and crowded or poorly sanitized environments. Standing water and wet, dirty pens can increase risk in domestic waterfowl.

Wild waterfowl are an important part of the disease picture. Outbreaks in wild birds often occur in fall and winter, and stressed birds may shed the bacteria. Domestic geese may be exposed when they share ponds, feed areas, or contaminated environments with wild birds or with other infected domestic birds.

Stress and management problems can make infection more likely or more severe. Overcrowding, transport, sudden weather changes, poor sanitation, and delayed carcass removal can all raise flock risk. Your vet may also consider whether another disease or environmental stressor made the flock more vulnerable.

Diagnosis starts with the pattern of illness. Your vet will ask about sudden deaths, how many birds are affected, recent additions to the flock, contact with wild waterfowl, water sources, and sanitation. A physical exam of sick birds helps, but avian cholera cannot be confirmed by signs alone.

Confirmation usually requires laboratory testing. The standard test is bacterial isolation and identification of Pasteurella multocida from a fresh carcass or appropriate samples. PCR may also be used. Necropsy findings can support suspicion, including enlarged liver and spleen, hemorrhages, excess fluid around organs, and small necrotic spots in the liver or spleen.

Your vet may also recommend testing to rule out other serious causes of sudden death in geese, including avian influenza, duck viral enteritis, colibacillosis, and other septicemic infections. That is one reason not to start random treatment at home before speaking with your vet or a diagnostic lab.

Prevention centers on biosecurity and sanitation. Keep geese away from wild waterfowl when possible, especially around shared ponds, feed, and water. Clean and disinfect feeders and waterers regularly, remove wet bedding, and do not let carcasses remain in pens or near water sources. Good sanitation is one of the most practical ways to lower risk.

Try to reduce stress on the flock. Avoid overcrowding, quarantine new birds before mixing them with resident geese, and limit unnecessary visitors, equipment sharing, and movement between bird groups. USDA biosecurity guidance for poultry also emphasizes controlling wildlife access, using clean water, and reducing contamination carried on boots, tools, and vehicles.

If you have repeated losses or live in an area with known waterfowl disease activity, ask your vet whether additional flock planning is needed. That may include a written outbreak response plan, diagnostic lab contacts, and discussion of whether vaccination is relevant for your region and management system. Prevention is rarely one single step. It is a series of habits that lowers risk over time.