Colibacillosis in turkeys: symptoms, airsacculitis and prevention
Colibacillosis caused by pathogenic strains of the bacterium E. coli (APEC) is a common and costly disease in turkeys — it almost always appears as a secondary problem, once the birds’ immunity drops or the house environment deteriorates. Learn how to recognise it, how to prevent it, and how to keep treatment records.
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What is colibacillosis in turkeys?
Colibacillosis is a bacterial disease caused by pathogenic strains of Escherichia coli, abbreviated as APEC (avian pathogenic E. coli). E. coli itself is widespread in the gut of healthy birds and in the house environment, so colibacillosis is almost never the “first” disease. It appears as a secondary problem — when flock immunity drops or when the house environment (dust, ammonia, moisture, draughts) weakens the airways and mucous membranes. In turkeys, which have an exceptionally sensitive respiratory system, the disease tends to be especially frequent and severe. More about the species: Turkey farming.
Why does air sac inflammation dominate in turkeys?
Turkeys, like all birds, have air sacs — thin-walled “balloons” connected to the lungs that distribute air throughout the body. In turkeys they are large and delicate, and the respiratory system copes poorly with dust and ammonia. When APEC reaches the airways of a weakened bird, it most often causes air sac inflammation (airsacculitis): the walls thicken, fill with yellowish cheesy discharge and lose their transparency. This impairs breathing, slows growth, and at slaughter such birds are more often condemned. That is why in turkeys colibacillosis is associated above all with respiratory problems.
How does colibacillosis link with mycoplasmosis and ventilation?
In turkeys colibacillosis rarely acts alone. It very often overlaps with mycoplasmosis (chronic respiratory disease, CRD) and with viral respiratory infections. Mycoplasma and viruses damage the lining of the trachea and bronchi, and APEC exploits this weakness to penetrate deeper — into the air sacs and the blood. Poor ventilation, high ammonia levels and dust add to this picture by irritating the airways. In practice, colibacillosis in turkeys is usually the result of several factors overlapping at once, rather than a single cause.
Septicaemia, pericarditis and perihepatitis, yolk sac
When APEC passes from the airways into the bloodstream, septicaemia (colisepticaemia) develops — a generalised infection of the whole organism. In turkeys it is accompanied by characteristic changes: pericarditis (inflammation of the membrane around the heart), perihepatitis (inflammation of the liver capsule) and fibrinous deposits on the internal organs. In poults in the first days of life a separate form is yolk sac inflammation (poor yolk resorption) — the sac does not absorb properly and becomes a focus of infection, leading to deaths in the first week. These forms are damaging because the long turkey rearing period means respiratory and systemic problems accumulate over many weeks.
Colibacillosis, other diseases and farm hygiene
Because colibacillosis in turkeys is a secondary disease, working on the underlying causes pays off most: the house environment, immunity and hygiene. Good ventilation, dry litter, mycoplasmosis control and biosecurity reduce infection pressure more than treatment alone. The general rules of flock protection are described in Poultry farm biosecurity, and an overview of other diseases and their signs is in Poultry diseases — symptom table. If you suspect disease, always consult a veterinarian.
How colibacillosis hits a turkey flock
Each of these signals should prompt the farmer to consult a veterinarian and check the house environment.
Respiratory signs and rales
Turkeys cough, sneeze, breathe with an open beak and make characteristic rattling sounds (rales). This is the first sign that the airways are irritated and that E. coli may have entered the air sacs.
Air sac inflammation
The air sacs thicken and fill with yellowish, cheesy discharge. The bird is poorly oxygenated, grows more slowly, and at slaughter such carcasses are more often condemned.
Lethargy, ruffled feathers and poor appetite
Sick turkeys stand dull, with ruffled feathers, and eat and drink less. The flock becomes uneven — some birds clearly lag behind in body weight.
Septicaemia and sudden deaths
When E. coli enters the blood, septicaemia develops with pericarditis and inflammation of the liver capsule. In more severe outbreaks deaths can rise sharply within a few days.
Yolk sac inflammation in poults
In the youngest birds in the first week of life the yolk does not absorb properly and becomes a focus of infection. This results in deaths shortly after the poults are placed.
Poorer results and longer rearing
Weaker growth, higher feed use and higher mortality. With the long turkey rearing period, respiratory problems accumulate over weeks, so losses grow the longer the disease lasts.
How to prevent colibacillosis and how to act when disease is suspected
As a secondary disease, the foundation is the house environment, immunity and hygiene — antibiotic treatment must be prudent and antibiogram-guided.
Ventilation and low ammonia
Good ventilation, low ammonia levels and little dust protect the turkey’s sensitive respiratory system. This is the single most important factor, because healthy airways do not let E. coli penetrate deeper. Details on the building: Turkey house requirements.
Dry litter and correct stocking
Dry, friable litter limits moisture and ammonia release, while correct stocking reduces density and infection pressure. See: Poultry house litter and Turkey stocking density.
Poult quality and hatchery hygiene
Healthy, well-hatched poults from a clean hatchery suffer less from yolk sac inflammation. Egg and hatchery hygiene limits E. coli infection right at the start, before the poults reach the house.
Mycoplasmosis control and biosecurity
Controlling mycoplasmosis and other respiratory infections removes the “entry gate” for E. coli, while biosecurity reduces the introduction of pathogens onto the farm. The rules are described in Poultry farm biosecurity.
Antibiogram-guided treatment — prudently
Treatment of colibacillosis relies on an antibiotic, but it is selected by a veterinarian based on an antibiogram (a bacterial sensitivity test). Prudent use limits resistance and protects drug efficacy. If you suspect disease, contact a veterinarian.
Treatment records and withdrawal
Every administration of a medicine must be recorded: date, drug, dose, route of administration and the withdrawal period before slaughter. DlaFerm.pl lets you keep these records digitally. More: Treatment records and drug withdrawal.
Frequently asked questions about colibacillosis in turkeys
What causes colibacillosis in turkeys?add
It is caused by pathogenic strains of the bacterium E. coli, known as APEC (avian pathogenic E. coli). The bacterium itself is common in the gut and the environment, so the disease almost always appears as a secondary problem — once the birds’ immunity drops or the house environment deteriorates.
Why is air sac inflammation so common in turkeys?add
Turkeys have an exceptionally sensitive respiratory system and large, delicate air sacs. Dust, ammonia and poor ventilation irritate the airways, and E. coli enters the air sacs and causes inflammation (airsacculitis) with yellowish, cheesy discharge. This is the most common and most damaging form of colibacillosis in this species.
What is the link between colibacillosis and mycoplasmosis?add
Mycoplasmosis (chronic respiratory disease) damages the lining of the trachea and bronchi, and E. coli exploits this weakness to penetrate deeper. In turkeys the two diseases very often overlap, and poor ventilation makes it worse. That is why controlling mycoplasmosis is an important part of colibacillosis prevention.
Can colibacillosis in turkeys be cured with an antibiotic?add
Treatment relies on an antibiotic, but it should be selected by a veterinarian based on an antibiogram — a test of the sensitivity of the given E. coli strain. Prudent, targeted treatment limits resistance. The antibiotic alone is not enough if the house environment is not improved and the causes of the secondary infection are not removed.
How can colibacillosis in turkeys be prevented?add
Working on the causes pays off most: very good ventilation, low ammonia and dust, dry litter, correct stocking, poult quality, hatchery hygiene, mycoplasmosis control and biosecurity. It is a secondary disease, so healthy airways and a clean environment protect the flock more effectively than treatment alone.
How does DlaFerm.pl help with colibacillosis?add
DlaFerm.pl enables digital treatment and withdrawal records — legally required documentation for every administration of a veterinary product. The Flock Card lets you track deaths, growth and feed use, which makes early detection of respiratory problems easier. The data are always available for veterinary inspections.
Sources & resources
Keep treatment records with DlaFerm.pl
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