August 30, 2025
Infectious Coryza in Poultry
Infectious coryza is a bacterial respiratory disease affecting poultry, particularly chickens. It is caused by the bacterium Avibacterium paragallinarum. The disease is characterized by nasal discharge, sneezing, swelling of the face (especially under the eyes), and decreased egg production. Here’s a detailed overview of the disease:
Symptoms
Nasal discharge: Clear or cloudy discharge from the nostrils.
Sneezing and coughing: Frequent sneezing and coughing.
Swelling of the face: Particularly around the eyes and wattles.
Reduced appetite: Chickens may eat less, leading to weight loss.
Reduced egg production: Laying hens often show a significant drop in egg production.
Watery eyes: Eyes may appear watery and sometimes have a foamy discharge.
Depression and lethargy: Infected birds may appear weak and lethargic.
Transmission
Direct contact: The disease spreads through direct contact with infected birds.
Aerosol transmission: It can also spread through the air, especially in crowded conditions.
Contaminated equipment: Feeders, drinkers, and other equipment can be sources of infection if not properly sanitized.
Carrier birds: Some birds may carry the bacterium without showing symptoms and can spread the disease to healthy birds.
Diagnosis
Clinical signs: Diagnosis is often based on observing the characteristic symptoms.
Laboratory tests: Confirmation is done through laboratory tests such as bacterial culture, polymerase chain reaction (PCR), or serological tests.
Prevention
Biosecurity: Implement strict biosecurity measures to prevent the introduction and spread of the disease. This includes isolating new birds before introducing them to the flock and avoiding contact with wild birds.
Vaccination: Vaccines are available and can be an effective preventive measure. Consult a veterinarian for an appropriate vaccination schedule.
Good management practices: Maintain good hygiene, provide adequate space, and ensure proper nutrition for the birds.
Economic Impact
Infectious coryza can cause significant economic losses due to reduced egg production, decreased growth rates, increased mortality, and the cost of treatment and prevention measures.
Conclusion,
Infectious coryza is a serious disease that requires prompt attention to prevent severe outbreaks in poultry farms. Good management practices, vaccination, and strict biosecurity are key to controlling and preventing the disease. If you suspect an outbreak, contact a veterinarian immediately for proper diagnosis and treatment.
