Bird flu — avian influenza — is the disease that keeps poultry farmers awake at night. It spreads fast, kills fast, and because it's a notifiable disease (one you must report to the authorities), an outbreak can mean compulsory culling (the authorities killing off your whole flock to stop the disease). Knowing the signs and keeping it out is not optional.

1. What bird flu is

Avian influenza is a disease caused by a virus, carried by wild birds — especially waterfowl (ducks, geese and similar water birds) — which often show no signs themselves. When it reaches domestic poultry it can be devastating — some types kill within days, and the disease spreads rapidly through a flock and between farms.

2. Symptoms to watch for

  • Sudden death with no obvious cause
  • Swollen head, comb and wattles (the red skin under the chin), sometimes turning blue or purple
  • Breathing problems — gasping, coughing, nasal discharge
  • Greenish diarrhoea
  • A sharp drop in egg production
  • Loss of appetite and listlessness

3. How it spreads

Bird flu moves through contact with infected wild birds, contaminated feed or water, and — very easily — on people, vehicles, equipment and clothing that have been near infected birds. Live-bird markets are a known high-risk route in Nigeria.

4. What to do if you suspect it

Report it immediately to your local veterinary or agricultural authority. Isolate the flock, stop all movement of birds, people and equipment on and off the farm, and do not sell or eat sick birds. Bird flu has no practical treatment — the official response is quarantine (sealing off the farm and stopping all movement) and culling (killing the birds) to stop it spreading.

5. Prevention — biosecurity (steps to keep disease off your farm) is everything

  • Keep wild birds away from your flock, feed and water.
  • Control visitors, vehicles and equipment entering the farm.
  • Don't mix ages or introduce birds of unknown health status.
  • Clean and disinfect footwear, tools and housing regularly.

For a full breakdown of these measures, see our poultry farm biosecurity guide, and to catch trouble early, learn the symptoms of a sick chicken.

Key takeaways

  • Bird flu spreads easily and must be reported to the authorities.
  • Sudden death and a blue, swollen comb are red flags.
  • Report suspected outbreaks immediately — don't sell sick birds.
  • Strict biosecurity is the only real protection.