- ✓Recognise the three faces of Newcastle disease depending on age
- ✓Know what to do, and what not to do, when you suspect it
- ✓Understand why vaccination and biosecurity are the only protections
One virus, three faces
| Age | What you see | Speed |
|---|---|---|
| Young chickens | Dullness, difficulty breathing, greenish diarrhoea, mortality that explodes | Very fast: a large part of the flock within a few days |
| Pullets | Nervous signs: trembling, twisted neck (torticollis), circling, paralysed wing or leg | A few days |
| Adult layers | Almost nothing to see, except laying that drops sharply, shell-less, discoloured, misshapen eggs, watery whites | Drop in laying within a week |
What should make you look up: the mix of respiratory and nervous signs, mortality that climbs fast, a sharp drop in laying. The NEXTEKCI video “The same disease has three faces” in the Academy shows it in one minute.
How it gets in
The virus travels with everything that moves: village birds and poultry bought at the market, wild birds, cages and lorries, shoes, visitors, traders who go from one farm to another, droppings and carcasses thrown outside. A single sick bird brought into a house is enough.
What to do when you suspect it
- Isolate the house: nobody goes in or out without changing boots; no shared equipment.
- Call the veterinarian immediately: they confirm (signs, post-mortem, laboratory) and report it to the veterinary services. Newcastle disease is a notifiable disease: it is not a disgrace, it is what protects your neighbours and yourself.
- Do not sell, do not move birds, alive or dead; do not throw carcasses outside (pit with lime, incineration).
- Do not treat with antibiotics “just in case”: they do not act on a virus; the veterinarian may prescribe them only against secondary infections.
- Support the remaining flock (water, vitamins as advised) and, according to the veterinarian's decision, carry out emergency vaccination of the neighbouring houses that are not affected.
After the outbreak: cleaning, disinfection, an extended sanitary break (21 to 30 days), cages and equipment disinfected, and a vaccination programme reviewed with the veterinarian.
The only protections
Vaccination: a programme that is followed (first dose at around one week, boosters as the veterinarian decides; for layers, boosters throughout their life) with an unbroken cold chain. A properly vaccinated flock resists; a “vaccinated” flock given a vaccine killed by heat does not.
Biosecurity (lesson 8 of this level): no village birds on the farm, no unsold birds brought back, market cages disinfected, visitors limited, footbath, carcasses disposed of properly. Newcastle disease has no cure; it only has barriers.
For the entrepreneur
- ›No compromise on the Newcastle vaccine: written programme, dates respected, cool box, boosters for layers.
- ›Strictly forbid village poultry and market birds on the farm, and the return of unsold birds.
- ›If Newcastle disease is suspected: isolation, veterinarian, reporting; never a panic sale that spreads the disease and destroys your reputation.
For the technician
- ›Any combination of respiratory and nervous signs, or a sharp drop in laying, is reported within the hour.
- ›Immediate isolation of the house, dedicated boots and clothing, carcasses in a pit with lime.
- ›No antibiotic without a prescription; emergency vaccination of neighbouring houses only on the veterinarian's decision.
The 3 questions to ask your technician this week
- On what dates was the Newcastle vaccination done, with which vaccine, and how was it stored?
- Have any village poultry or birds bought at the market come onto the farm recently?
- If there are nervous signs or a sharp drop in laying, who do you call first and how do you isolate the house?
Key points
- •Three faces: lightning mortality in young birds, nervous signs in pullets, drop in laying and abnormal eggs in layers.
- •The virus gets in through village and market birds, cages, visitors, carcasses thrown outside.
- •Suspicion = isolate, call the veterinarian, report, sell or move nothing, no antibiotic “just in case”.
- •No treatment: only vaccination (cold chain, boosters) and biosecurity protect.
- •After an outbreak: disinfection, sanitary break of 21 to 30 days, vaccination programme reviewed.