How to prevent and treat chicken coryza? Detailed explanation of prevention and treatment methods

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Chicken coryza is caused by Haemophilus paragallinarum.
Haemophilus paragallinarum is pleomorphic. On primary isolation it is a Gram-negative small coccobacillus, bipolar staining, does not form spores, has no capsule and no flagella, and is non-motile. The organism is initially rod-shaped or coccobacillary and tends to form filaments. Later it undergoes degeneration, producing fragments and irregular forms; at this point, transferring it to fresh culture medium can restore the typical rod-shaped or coccobacillary state.
  Flocks affected by chicken coryza: it occurs in chickens of all ages, and older chickens are more severely affected. Pheasants, guinea fowl and quail can occasionally be affected, but the nature of the disease differs from that in chickens, with toxic reactions.
Symptoms of chicken coryza:
When the lesions occur as inflammation of the nasal cavity and sinuses, the disease often presents only as a thin clear discharge from the nasal cavity; the nostrils first discharge a clear fluid that later turns into a serous mucoid secretion, sometimes with sneezing. The face is swollen or shows edema, with conjunctivitis and swollen eyelids. Feed and water intake decrease, or there may be diarrhea, and body weight decreases. Sick chickens are depressed, with swelling of the face, head drawn in, and standing still. Chicks grow poorly, and adult hens lay fewer eggs; the wattles of roosters are commonly swollen. If the inflammation spreads to the lower respiratory tract, breathing becomes difficult; sick chickens often shake their heads to expel mucus from the respiratory tract, and there are rales. Clots of secretion may also accumulate in the throat. These are the typical symptoms.
Because the symptoms of chicken coryza resemble those of chronic respiratory disease, chronic fowl cholera, fowl pox, and vitamin deficiency disorders, diagnosis is relatively difficult, and concurrent infection occurs easily.
Chicken coryza has a high incidence rate and a low mortality rate, but it readily causes death through secondary complications, such as chronic respiratory disease of chickens, chicken colibacillosis, and pullorum disease.
Growing chickens have fewer cases and fewer deaths, and in the late epidemic stage fewer chickens die or are culled than in laying flocks. The main lesions are acute catarrhal inflammation of the nasal cavity and sinus mucosa, with mucosal congestion and swelling, the surface covered with large amounts of mucus, and exudate clots in the sinuses that later become caseous necrotic material. Catarrhal conjunctivitis is common, with conjunctival congestion and swelling. There is subcutaneous edema of the face and wattles. In severe cases, inflammation of the tracheal mucosa may be seen, occasionally with pneumonia and airsacculitis.
 
  Prevention of chicken coryza:
1. Heating equipment and automatic ventilation control devices should be installed, which can significantly reduce the ammonia concentration in the chicken house.
2. Disinfecting with the chickens present to settle dust from the air and purify the air has played a positive role in preventing and controlling this disease.
3. Strengthening the cleaning and disinfection of drinking water utensils and the disinfection of drinking water are routine measures for disease prevention.
4. Farm staff should strictly implement epidemic prevention systems such as changing clothes, bathing, and changing shoes. When multiple people must enter the house due to work needs, disinfection with the chickens present should be carried out immediately after work is finished.
5. The chicken house, especially a house with sick chickens, is a heavily contaminated place, so great attention must be paid to cleaning and disinfecting the chicken house.
Disinfection of the environment outside the chicken house and the work of removing weeds and debris also deserve attention. Therefore, comprehensive prevention and control are indispensable and important measures to prevent the occurrence of this disease.
Haemophilus paragallinarum is very sensitive to sulfonamide drugs, which are the first-choice drugs for treating this disease.
Classic regimen for the prevention and treatment of chicken coryza: sulfamonomethoxine sodium + Aqi Chuanding
          Morning: sulfamonomethoxine sodium (2000 jin water per bag) in concentrated drinking water, for 3—5 consecutive days
Afternoon: Aqi Chuanding (400 jin water per bag) in concentrated drinking water, for 3—5 consecutive days
Henan Dekang (Sipurei) Animal Pharmaceutical Co., Ltd. 
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