Short answer: Infectious bronchitis is a highly contagious virus that hits the windpipe and, in layers, the part of the oviduct that makes the shell, so the first sign is often a drop in eggs rather than a loud cough. Birds sneeze, rattle and gasp, and some strains damage the kidneys of young chicks. Vaccination on your vet's schedule, dry clean litter and steady airflow keep the disease manageable in Ghanaian houses.
Key takeaways
- In layers, the first sign is often a fall in egg numbers or poor shells, before the breathing noise gets loud.
- Write down your normal daily lay so a drop of a few eggs does not slip past you.
- Vaccines match some strains better than others. Ask your vet which strains are around your area.
- Dust, ammonia and damp litter make the airways more vulnerable, especially during the harmattan.
- Rough, thin or misshapen eggs are a clue, not a diagnosis. Your vet confirms it with samples.
Why infectious bronchitis catches layers off guard
On most farms, the first thing that goes wrong with infectious bronchitis is not a cough. It is the egg tray. A farmer collects ninety eggs one morning and seventy-five two days later, looks at the birds, and sees nothing worse than a few quiet hens. By the time the sneezing starts at the back of the house, the damage to the laying tract is already done.
Infectious bronchitis is caused by a coronavirus of birds. It moves quickly from bird to bird through the air, so nearly every bird in a house can be infected within days. Most birds recover, but a layer that has been hit does not always climb back to her old egg numbers, and a broiler infected early can grow more slowly. That is why this disease costs more than its name suggests.
We vaccinate our chicks against infectious bronchitis at the hatchery, and the batch record shows it. That protection is real, but it does not cover every strain, and it cannot stop a house that is already full of virus from getting sick. Most of the work happens on your side of the fence, and the rest of this article is about that work. You can read how our flocks are sourced on the imported day-old chicks page.
The breathing signs: sneezing, rattles and gasping
Breathing signs tend to appear together, and they are easier to hear than to see at first. Stand quietly at the door of the house early in the morning, before the birds are fully active. A flock with IB often makes a faint wheeze or snore, and the sound is worst in birds huddled against the walls.
- Sneezing and head shaking, especially when birds first come off the perch.
- Watery eyes, and a swollen, crusted area under the eyes in some birds.
- Nasal discharge that runs down to the beak.
- Rattling or gurgling on each breath, which you can hear by holding a bird close to your ear.
- Gasping and open-beak breathing in the worst cases, usually in young birds.
- Birds standing hunched with fluffed feathers and a dull look.
In many strains, infectious bronchitis hits most of the flock quickly while deaths stay fairly low. Do not take comfort from low deaths. A flock that is breathing badly eats less, grows less and lays less, even if nobody dies.
Ammonia from wet litter makes everything worse. If your eyes sting when you walk into the house, the birds' airways are being irritated too. Pick a time of day, walk the house, and write down what you hear, what you see and what you smell. If the combs are scabbed as well, pox may be running alongside the breathing trouble, so read our fowl pox article too.
The egg problems that often come first
Egg changes are the clearest clue in a layer house, because you already look at eggs every day. Pick up a few from the tray each morning and compare them with last week. You are looking for shells that have changed in texture, shape or thickness, and for whites that look thinner than usual.
| What the egg looks like | What it can mean | What to do |
|---|---|---|
| Soft or thin shells, some with little or no shell | Damage to the shell-making part of the oviduct, often with a fall in lay | Call your vet, check calcium and grit, and note the date it started |
| Rough, wrinkled or pitted shells | Surface damage to the shell while it forms | Check the litter, nest boxes and birds for breathing trouble |
| Watery, thin whites with normal shells | Poor albumen quality, a common effect in layers | Keep these eggs apart and tell the vet |
| Misshapen eggs, very round or very long | Disturbed egg formation | Vet check, then review recent stress and feed changes |
| Sharp fall in lay with normal-looking eggs | Early infection before shape changes show | Call your vet the same day |
None of these eggs is a diagnosis on its own. Hot weather, a sudden feed change, rough handling and a wrong calcium level can all change shells. What infectious bronchitis produces is a pattern: several of these changes together, in a house where the birds are also breathing badly. That pattern is what you describe to the vet.
Strains that go for the kidneys
Some infectious bronchitis strains behave differently. Instead of working mainly on the windpipe and the egg tract, they settle in the kidneys. These are the strains that worry hatchery people most, because young chicks are the most vulnerable to them.
A kidney-affected bird often looks dull and thirsty. Its droppings may turn watery and chalky, and you may see white urate deposits on the litter. At post-mortem, the kidneys look pale and swollen, and the tubes that carry urine can be full of white material. Some birds die quickly. Others stop growing and never catch up with their flock.
The lesson for a grower is simple. If young birds drink a lot, have runny droppings and lose weight, do not write it off as ordinary diarrhoea. Ask your vet for a post-mortem on one or two birds early, while the evidence is still fresh. A laboratory result is what tells you which strain you are dealing with, and that changes what you do next. If the nervous signs appear as well, read our Newcastle guide before you assume anything.
How the virus moves: air, litter, people and equipment
Infectious bronchitis spreads through the air over short distances, and it rides on almost anything that carries particles. A sick bird coughing a fine spray can infect birds a few metres away. The virus also clings to dust, feathers and litter, and it survives long enough to be carried on shoes, crates, feed sacks and the wheels of a vehicle.
Think about the route a visitor takes. They arrive from another farm, walk past the feed store, step into the house in the same shoes and then touch the nest boxes. That is three ways to carry virus in five minutes. You do not need to be unfriendly to stop it. You need one rule that applies to everybody.
- Clean boots or dedicated house shoes for each house, and a footbath at the entrance that you actually refill.
- No visitor who has been in another poultry house that day.
- Crates and egg trays that go out clean and come back cleaned before they re-enter the house.
- Wild birds and rodents kept out of the feed and the house as far as you can manage.
If you are still designing the house, put the entrance and the wash area on the plan before the first chick arrives. The broiler house setup guide shows where those steps fit. It is much harder to add a wash step once the house is full of birds.
Many strains under one name, and why the vaccine has to match
Infectious bronchitis is not one virus. It has many types, usually called serotypes or variants, and a single vaccine does not protect against all of them. A product that works well in one country can give weaker protection in another, where different types are circulating. This is one reason a farmer can vaccinate correctly and still see disease.
What this means for you is simple. Ask your vet which strains are circulating in your area, and whether the vaccine you use covers them. If samples from your farm have gone to a laboratory before, ask what was found. Your vet may suggest a different product, a different schedule or an extra booster if the strain is a poor match.
Do not swap vaccines because a friend had better luck with another brand. Protection depends on the vaccine, the strain, the age of the birds and the way the vaccine was given. Follow your vet's advice before you change anything, and treat any change as a plan you record.
Vaccination: what the hatchery gives and what comes next
At the hatchery, our chicks are vaccinated against infectious bronchitis early in life, and the batch record shows which vaccines each batch received. Hatchery vaccination is usually given by spray or eye drop, because that is practical for chicks in large numbers. The exact method depends on the vaccine your vet chooses.
After the first dose, most layer and broiler programmes include one or more boosters, timed to the age of the birds and to the disease pressure on the farm. A typical example is a booster in the grower phase and another before the birds start laying. That is only an example. Your vet decides the number of doses and the timing, and you should follow your vet's advice on every one.
Record every dose: the date, the age of the birds, the number vaccinated, the vaccine name and batch number, and who gave it. When a flock drops in lay months later, that record is the first thing your vet will ask for. If you are starting a new layer house, our layer day-old chicks page explains which lines we supply, and you can place an order once your vet has agreed the plan.
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Why vaccinated birds still get sick
When a vaccinated flock gets infectious bronchitis, the same handful of causes keep showing up. None of them is a mystery, and most of them are cheap to fix.
- The water used for a water-given vaccine had chlorine in it, or was warm enough to weaken the live virus.
- The vaccine sat in the sun or outside the cold chain for too long.
- The vaccine was mixed into too much water, or the birds did not drink it quickly enough for every bird to get a dose.
- The birds were stressed at the time, through heat, crowding, moving or a dusty day.
- The flock was already carrying a strain the vaccine does not match well.
- The birds were already infected before the vaccine had time to work.
Your vet can help you work through each of those. Ask what the water source is, how long the vaccine sat out, how quickly the birds drank, and what happened in the house in the week before. You will learn more from those answers than from changing products. If you want a second pair of eyes on your records, WhatsApp the hatchery on +233 24 915 1503 and we will talk it through with you.
How Ghana's weather pushes infectious bronchitis up
The harmattan is the season most farmers dread. From about December into January, dry dusty winds carry fine dust across the country, most heavily in the north, and the air inside an open-sided house can be thick with it. Dust irritates the windpipe and the lungs. A bird already carrying IB will breathe worse, and the virus has more places to hide in dust.
The rains bring the opposite problem. Damp litter after a week of showers gives off ammonia, and in a closed house the humid air hangs over the birds. Wet litter and poor ventilation together are a reliable way to turn a mild breathing problem into a bad one.
Cold nights matter too. Birds huddle at night to keep warm, bunch together, breathe the same air and drop their guard. If you open the sides in the day to clear ammonia, close the lower curtains at night and keep the draught off the roost. Ventilation is a balance, and it changes with the season. Check it at dusk and again at dawn.
What to do during a suspected outbreak
- Call your vet the same day, and describe what you see in the house, not just what you think it is.
- Separate the worst birds, and keep their feed and water apart from the rest.
- Stop moving birds, crates and eggs off the farm until your vet has looked at the flock.
- Tighten the entrance: one set of boots, one visitor rule, and the footbath refilled.
- Set aside eggs that are visibly poor, and keep them out of the good egg trays.
- Write down the numbers every day: birds breathing badly, deaths, eggs and feed used.
Do not give medicines to the whole flock on the strength of a guess. Antibiotics do not kill the virus. Your vet may use them to treat a bacterial infection that moves in behind the virus, and that is a decision for your vet to make, with the birds in front of them. The biosecurity guide has the full footbath and visitor routine if you need it written down.
Keeping the numbers that tell you it is IB
Most arguments with a vet about IB come down to whether the drop in eggs is real. Without a written number, it is a feeling. With one, it is a timeline. Write down the eggs collected each morning, the number of birds you think are breathing badly, the number that died and the feed used. Put the date on every line.
A line in an exercise book is enough. If you keep the numbers on a phone, back them up. The point is that when you call the vet, you can say "lay fell from ninety eggs to seventy-five in two days, and six birds are sneezing" rather than "they are not laying." Our poultry record keeping guide shows a simple layout you can copy.
A record also protects you when a second problem shows up. A flock with infectious bronchitis may later get a bacterial infection, a heat stress problem or a feed problem on top. Clear numbers help your vet separate the causes instead of treating the last thing they hear about.
Questions farmers ask
Can people catch infectious bronchitis?
No. Infectious bronchitis is a disease of birds, and it does not spread to people the way bird flu can. You should still wash your hands after handling sick birds, keep your boots clean and keep visitors out of the house. Those habits protect your flock and your family from other germs as well, so they are worth keeping even when the birds are well.
Will a vaccinated flock still get infectious bronchitis?
Sometimes, yes. Vaccination reduces illness and helps birds recover faster, but no vaccine covers every strain or every bird perfectly. A vaccinated flock that breathes badly and drops in lay is still worth a call to your vet, who can check whether the vaccine matched the strain and whether the timing was right.
How long does a flock take to return to normal lay?
It depends on the strain, the age of the hens, the stress they went through and how quickly the house was managed. Many flocks take several weeks to climb back, and some hens never return to their earlier peak. Keep counting eggs through the recovery, so you know how the flock is doing rather than guessing.
Can I treat infectious bronchitis with antibiotics?
Antibiotics do not kill the virus. Your vet may use them to treat a bacterial infection that moves in on a damaged airway, and that can make a real difference to the birds. Ask your vet what they are treating and why, and follow your vet's advice on how long to keep birds separated and when to return to normal management.
How is infectious bronchitis different from Newcastle disease?
Both affect the breathing and both can cause a drop in lay, so the early signs overlap. Newcastle often adds twisted necks, greenish diarrhoea and nervous signs, and it is a notifiable disease in many countries. Infectious bronchitis rarely causes those nervous signs. Only a laboratory test can separate them, so take your vet a few sick birds and your egg record. Our Newcastle guide covers the differences in more detail.
Can I sell eggs from a flock with infectious bronchitis?
Infectious bronchitis is not a food-safety threat to people in the way bird flu would be, but egg quality can suffer badly. Thin, soft or misshapen eggs do not sell as table eggs, and buyers notice. Set the poor eggs aside, and follow your vet's advice on whether the rest of the eggs can go to market.
Does infectious bronchitis affect broilers too?
Yes. Broilers that catch it early can grow more slowly, and some strains cause higher losses, particularly the kidney-affecting strains in young birds. The signs in broilers are mostly breathing trouble and weight gain that falls behind. Your vet should check any flock that is breathing badly and slipping on weight, before you decide how to feed or house it.
Can I give the vaccine in drinking water myself?
Some infectious bronchitis vaccines are given in drinking water, but success depends on water quality, water temperature, timing and how many birds drink in the window. Chlorine and heat can destroy live vaccine. Ask your vet to show you the method on your own farm, and follow your vet's advice on the exact schedule.
