A disease that occurs, when an organism's susceptible body cells are invaded by a pathogenic virus or infectious virus particles.

1. Sachith Sri Mihiraj
BSc (Special), M.Agri

2. • What is a Viral Disease?
A disease that occurs, when an organism's
susceptible body cells are invaded by a
pathogenic virus or infectious virus particles.

3. Common Viral Diseases in Broilers
• Infectious Bursal Disease (Gumboro)
• Newcastle Disease
• Fowl Pox
• Infectious Bronchitis (IB)

4. Infectious Bursal Disease (Gumboro)
• Etiology : caused by IBD virus from Birnaviridae family of RNA virus
• Mode of Infection : very infectious and spread easily from chick to chick
by droppings
Transmission between farms through infected clothing and equipment.

5. • Clinical Signs : seen only in chicken older than 3 weeks
 Feathers around the vent are stained with feces containing plenty of urates.
injured bursa leads to immunosuppression
 Plus, watery white diarrhea, anorexia, depression, ruffled feathers in neck
and head region.
• Control and prevention : Gumboro vaccine is recommended

6. Newcastle Disease
• Etiology :caused by Paramyxovirus (APMV – 1)
• Mode of transmission : by air, feed bags, infected dead birds, infected
houses and rodents
• Clinical signs : paralyzed wings and legs, twisted necks, depression,
watery greenish diarrhea, swelling of the tissues of the head and neck,
trembling, watery discharge from nostrils and
labored breathing
• Control and prevention: No specific treatment.
Antibiotic treatment of secondary bacterial
infections

7. Fowl Pox
• Etiology :caused by a Poxvirus
• Mode of transmission :
-By direct contact of infected or susceptible
birds
-By mosquitos and blood sucking
arthropods
• Clinical signs : diphtheritic lesions
• Control and prevention : vaccination

8. Infectious Bronchitis (IB)
• Etiology : caused by Coronavirus
• Mode of Transmission : spread through air, clothing,
poultry crates and equipment
• Clinical signs : Coughing , sneezing, gasping in
young birds
Loss of appetite
Wet litter
Retarded growth
• Control and Prevention : follow sanitary and quarantine
precautions