Infectious Bursal Disease (IBD)

Causative Agent:-

Infectious Bursal disease is caused by the Infectious bursal disease virus (IBDV) (birnavirus), a member of Birnaviridae, genus Avibirnavirus.

Species Affected:-


Clinical Signs

In affected chickens greater than 3 weeks of age, there is usually a rapid onset of the disease with a sudden drop in feed and water consumption, watery droppings leading to soiling of feathers around the vent, and vent pecking. Feathers appear ruffled. Chicks are listless and sit in a hunched position. Chickens infected when less than 3 weeks of age do not develop clinical disease, but become severely and permanently immunosuppressed.

Cheasy material in Bursa

Cheasy Material in Bursa

Hemorrhages on thigh region

Hemorrhages on thigh region

Bursa inflamed and reddish

Bursa inflamed and reddish


The virus is spread by bird-to-bird contact, as well as by contact with contaminated people and equipment. The virus is shed in the bird droppings and can be spread by air on dust particles. Dead birds are a source of the virus and should be incinerated.


There is no specific treatment. Antibiotics, sulfonamides, and nitrofurans have little or no effect. Vitamin-electrolyte therapy is helpful. High levels of tetracyclines are contraindicated because they tie up calcium, thereby producing rickets. Surviving chicks remain unthrifty and more susceptible to secondary infections because of immunosuppression.

To avoid the secondary infection, we recommend: –

  • Broad-spectrum antibiotics:
  • COTRIM-FS (Each 5 gm contains: Trimethoprim 160 mg and Sulphamethoxazole 800 mg): @ 1 gm in 1 litre of drinking water

Vitamin-electrolyte therapy:-

  • C LYTE (Vitamin C with electrolytes):
  • Powder: Through feed: 150 gm / Metric ton of feed
  • Liquid: Through drinking water: 1ml /litre of drinking water


A vaccine is commercially available. Implementation of a comprehensive biosecurity program.

Also, Read: Fowl Cholera