Common clinical signs of Infectious Bronchitis can include:

• Sneezing
• Coughing
• Gasping or open-mouth breathing
• Rattly, wheezy, or noisy breathing
• Nasal discharge
• Watery eyes
• Swollen sinuses
• Reduced appetite
• Lethargy and depression
• Huddling under heat sources
• Reduced growth rates in young birds
• Increased water consumption
• Wet droppings
• Dehydration (kidney-affecting strains)
• Sudden drop in egg production
• Misshapen eggs
• Thin-shelled or soft-shelled eggs
• Pale or poor-quality eggshells
• Poor internal egg quality (watery albumen)
• Increased mortality in severe cases or when secondary infections are present

Clinical signs can vary depending on the strain of Infectious Bronchitis Virus (IBV), the age of the birds, vaccination status, and whether the respiratory tract, kidneys, or reproductive system are affected.

Chickens

1. Stress

Stress from transport, rehoming, overcrowding, extreme weather, moulting, or concurrent illness can weaken the immune system and increase susceptibility to Infectious Bronchitis.

2. Poor Biosecurity

Inadequate biosecurity practices increase the risk of the virus entering and spreading within a flock.

3. Overcrowding

High stocking densities increase close contact between birds, allowing respiratory droplets and secretions to spread more easily.

4. Introduction of New Birds

Introducing new birds without appropriate quarantine procedures can introduce the virus into previously unaffected flocks.

5. Lack of Vaccination

Unvaccinated birds are generally more susceptible to infection and may experience more severe clinical disease and production losses.

6. Poor Ventilation

Poor airflow can increase the concentration of airborne respiratory droplets within housing, facilitating the spread of infection.

7. Concurrent Disease

Birds already affected by respiratory disease, parasites, or other health issues may be more susceptible to severe clinical signs and secondary infections.

8. Immunosuppression

Birds with weakened immune systems are often less able to control infection and may experience more severe disease.

1. Respiratory Droplets

The virus spreads through droplets released when infected birds cough, sneeze, or breathe.

2. Direct Bird-to-Bird Contact

Healthy birds can become infected through close contact with infected chickens.

3. Contaminated Feeders and Drinkers

Shared equipment can spread the virus between birds and pens.

4. Contaminated Clothing and Footwear

People can unknowingly carry the virus between flocks on clothing, footwear, and equipment.

5. Movement of Birds

Transporting infected birds between properties, shows, markets, or sales can spread the disease to new flocks.

6. Contaminated Vehicles and Equipment

Crates, vehicles, tools, and handling equipment can transfer the virus between locations.

7. Recently Recovered Birds

Recovered birds may continue shedding the virus for a period of time and can still infect susceptible birds.

8. Airborne Spread Within Flocks

In enclosed housing, the virus can spread rapidly through the air, particularly where ventilation is poor.

1. Clinical Signs

Infectious Bronchitis may be suspected in birds showing coughing, sneezing, nasal discharge, noisy breathing, wet droppings, reduced egg production, or poor shell quality.

2. Flock History

Recent introduction of new birds, attendance at poultry shows, poor biosecurity, or the rapid spread of respiratory signs through a flock can increase suspicion of Infectious Bronchitis.

3. Physical Examination

A veterinarian may identify respiratory abnormalities, dehydration, poor body condition, or reproductive issues associated with the disease.

4. Laboratory Testing

• PCR testing is the most common method used to confirm Infectious Bronchitis Virus (IBV). Samples are typically collected using choanal, tracheal, or cloacal swabs.
• Serology Blood testing can be used to detect antibodies to IBV and assess previous exposure or vaccination status.
• Post-mortem findings may include inflammation of the trachea and airways, kidney enlargement, urate deposits, and reproductive tract abnormalities depending on the strain involved.

5. Rule Out Other Diseases

Several diseases can produce similar signs, including

• Mycoplasma (Often follows IB)
• Infectious Laryngotracheitis (ILT)
• Avian Influenza
• Newcastle Disease
• Infectious coryza

Laboratory testing is often required to confirm the diagnosis.

There is no specific cure for Infectious Bronchitis (IB). Treatment focuses on supportive care while the bird's immune system clears the infection.

1. Supportive Care

• Maintain Hydration: Ensure birds have constant access to clean water. Electrolytes may be beneficial in birds showing signs of dehydration or reduced water intake.
• Nutritional Support:Offer highly palatable, easy-to-digest foods to encourage eating and help maintain body condition during recovery.
• Provide Warmth: Keep affected birds warm, dry, and protected from drafts to reduce stress and conserve energy.
• Pain Relief: Respiratory disease can be uncomfortable and may reduce appetite and activity. Appropriate pain relief may improve comfort, encourage eating and drinking, and support recovery.

2. Control Secondary Infections

Secondary bacterial infections are common following Infectious Bronchitis and may require veterinary treatment. Antibiotics do not treat the virus itself but can help manage secondary bacterial complications.

3. Reduce Stress

Minimise handling, overcrowding, transport, and flock disruptions while birds recover.

4. Isolate and Monitor Affected Birds

Where practical, affected birds should be separated from the flock to allow close monitoring of breathing, appetite, hydration, droppings, and overall condition.

5. Monitor Recovery

Respiratory signs may persist for several weeks, while egg production and shell quality can take much longer to recover. Some birds may experience permanent reproductive tract damage following severe infection.

1. Vaccination

Vaccination is one of the most effective ways to reduce the impact of Infectious Bronchitis. Vaccinated birds generally develop milder disease and experience fewer production losses.

2. Maintain Strong Biosecurity

Good biosecurity practices help prevent the virus from entering and spreading within a flock. This includes limiting visitors, cleaning equipment, and maintaining dedicated footwear and clothing.

3. Quarantine New Birds

All new birds should be quarantined before introduction to the flock to reduce the risk of introducing Infectious Bronchitis and other infectious diseases.

4. Avoid Mixing Flocks

Mixing birds from different sources increases the risk of disease transmission and should be avoided where possible.

5. Maintain Good Ventilation

Adequate airflow helps reduce the build-up of respiratory droplets and improves overall respiratory health.

6. Reduce Stress

Minimising stress from overcrowding, transport, extreme weather, flock changes, and other illnesses can help support immune function.

7. Maintain Good Hygiene

Regular cleaning of housing, feeders, drinkers, and equipment helps reduce disease spread and improves flock health.

8. Monitor Flock Health

Early recognition of respiratory signs, reduced egg production, or changes in shell quality can help identify outbreaks sooner and limit their impact.

9. Limit Bird Movement

Bird shows, poultry sales, swaps, and unnecessary movement of birds between properties can increase the risk of introducing Infectious Bronchitis into a flock.

Seek veterinary advice if you notice:

• Birds are struggling to breathe, gasping, or breathing with an open beak
• Respiratory sounds become severe, including wheezing, rattling, or crackling
• Nasal discharge or swelling around the eyes develops
• Birds stop eating or drinking
• Signs of dehydration are present
• Significant lethargy or weakness develops
• Wet droppings or excessive water consumption are observed
• Egg production drops suddenly or egg quality deteriorates significantly
• Multiple birds within the flock become affected
• Mortality increases or sudden deaths occur
• Birds fail to improve with supportive care
• Secondary infections are suspected
• Any bird appears severely unwell or is rapidly deteriorating

Early veterinary intervention can help confirm the diagnosis, identify secondary infections, reduce flock losses, and improve recovery outcomes.