Colibacillosis (E. coli) in Poultry in Ghana

Colibacillosis is the disease poultry get when the bacterium Escherichia coli (E. coli) — normally a harmless resident of the gut and the litter — turns invader and gets into the bloodstream, air sacs and internal organs. It is not usually a "primary" disease that strikes healthy birds out of the blue; it is an opportunist that moves in when something else has weakened the flock: a respiratory virus or mycoplasma, dusty ammonia-laden air, wet litter, dirty water, heat stress, or a dirty navel at hatch. That is why colibacillosis wears so many faces — sudden-death septicaemia in growers, "navel ill" and yolk-sac infection in day-olds, and the airsac-and-membrane infections that condemn broilers at slaughter. It is one of the most common and costly bacterial diseases of poultry worldwide, and in Ghana's hot, humid conditions the triggers are everywhere. This guide explains how E. coli causes disease, what sets it off, and how to shut those triggers down.

Written by the Agro Prime Ghana poultry team and reviewed against current veterinary references (MSD Veterinary Manual and peer-reviewed poultry-science literature). Last updated September 2026.

What is colibacillosis?

Colibacillosis is the general name for any localised or systemic infection caused by Escherichia coli in poultry. The strains that cause disease in birds are known as avian pathogenic E. coli (APEC). The key to understanding the disease is that E. coli is everywhere on a poultry farm: it lives in the birds' intestines and is shed in droppings, so it saturates the litter, dust, water and surfaces of any poultry house. According to the MSD Veterinary Manual, large numbers of E. coli are maintained in the poultry-house environment through faecal contamination, and disease develops by one of two routes: either a virulent APEC strain carrying disease-causing genes overwhelms the bird, or an ordinary "commensal" E. coli seizes its chance in a bird whose defences have already been broken by something else. That second, opportunistic route is the one most Ghanaian keepers are really fighting — which is why colibacillosis is best thought of not as a disease you catch, but as a disease you allow when management or another infection weakens the flock.

The many faces of E. coli disease

Because E. coli can invade almost any tissue once it breaches the bird's defences, colibacillosis shows up in a confusing variety of forms — and recognising them helps you trace back to the trigger. MSD describes acute fatal septicaemia (colisepticaemia), and airsacculitis, pericarditis, perihepatitis and peritonitis — inflammation of the air sacs and of the membranes around the heart, liver and gut cavity. Other well-known forms include omphalitis (yolk-sac infection, or "navel ill") in newly hatched chicks, swollen head syndrome, salpingitis (oviduct infection, a major cause of dead layers), arthritis and osteomyelitis (infected joints and bones causing lameness), and cellulitis (infection under the skin that downgrades carcasses). The table below maps the common forms to the birds they typically strike, so you can read what an outbreak is telling you.

What triggers colibacillosis — the real story

Since E. coli is always present, the practical question is never "how did E. coli get in?" but "what let it cause disease?" The triggers fall into two groups. The first is other diseases that damage the bird first. MSD lists mycoplasmosis, infectious bronchitis, Newcastle disease and other infections as conditions that predispose birds to colibacillosis. This is the crucial link with chronic respiratory disease: Mycoplasma inflames the airways, and E. coli then invades the damaged lining to produce the deadly airsacculitis-and-polyserositis form. The second group is management and environment: poor ventilation that lets ammonia and dust scour the respiratory tract; wet litter that multiplies the bacterial load underfoot; contaminated drinking water that delivers E. coli straight to the gut; and pests such as rodents, flies and beetles. Add the ordinary stresses — overcrowding, chilling, overheating, transport, poor nutrition — and you have birds whose defences are down. Every one of these triggers is something you can influence, which is exactly why colibacillosis is considered highly preventable despite being so common.

Why air quality matters more than keepers think

If there is one under-rated trigger on Ghanaian farms, it is the air inside the house. Ammonia from wet, dirty litter is not just unpleasant — it directly damages the delicate lining of the respiratory tract, strips away the tiny cilia that sweep out invaders, and leaves the airways wide open for E. coli. And the cost is measurable even before any obvious disease: in a controlled Poultry Science study, Miles, Branton and Lott (2004) found broilers raised in 50 ppm ammonia weighed about 6% less, and those in 75 ppm about 9% less, than birds in clean air by the end of grow-out. That is pure lost profit from a gas you often cannot see — and the same ammonia that shaves growth is the trigger that lets E. coli turn a respiratory grumble into fatal airsacculitis. Getting ventilation and litter right is therefore not a "nice to have"; it is frontline colibacillosis control. In our heat that means moving enough fresh air to carry ammonia and moisture out without chilling the birds — a balance every keeper has to manage actively, especially in the humid season and during harmattan dust.

How E. coli spreads and takes hold

E. coli reaches birds by several routes, all of them manageable. The starting point for many flocks is the hatchery: MSD notes initial exposure often occurs at the hatchery stage, where contaminated eggshells and incubators seed yolk-sac infection before chicks ever reach the farm. On the farm, the bacterium cycles endlessly through faecal contamination of litter, feed, water and dust — birds pick it up by pecking the floor, drinking dirty water and, importantly, by inhaling contaminated dust, which is how it reaches the air sacs. Contaminated drinking water deserves special mention because it is so often overlooked: borehole and stored water, biofilm in old drinker lines, and open reservoirs can all carry heavy E. coli loads straight to the flock. Once inside a stressed or virus-damaged bird it multiplies and, in the septicaemic form, spreads through the bloodstream to the organs. Understanding this cycle makes prevention obvious: cut the contamination — clean chicks, clean water, dry litter, pest control — and remove the stressors and primary diseases that give E. coli its opening.

Treatment: useful, but not a substitute for prevention

Colibacillosis can be treated with antibiotics, but this is where many keepers are let down, because antibiotic resistance in avian E. coli is widespread. MSD reports that most APEC isolates are resistant to five or more antimicrobials, and that most are resistant to tetracyclines, streptomycin and sulfa drugs — some of the very products most easily bought over the counter. Fluoroquinolones, once a go-to, are now banned for poultry use in many countries. The practical implications are important. First, treating colibacillosis blindly, with whatever antibiotic is to hand, often fails and wastes money while breeding more resistance. Where treatment is needed, it should be guided by a veterinarian and, ideally, by a culture and sensitivity test that shows which drug still works — and always with correct dosing and withdrawal periods. Second, and more fundamentally, antibiotics do nothing about the trigger. If wet litter, bad air, dirty water or an underlying Mycoplasma infection caused the outbreak, the disease returns the moment the course ends. This is why responsible practice — set out in our guide to responsible antibiotic use — treats antibiotics as a limited emergency tool, not a management strategy.

Prevention: shut the triggers down

There is no vaccine that reliably covers all the E. coli strains a farm meets — MSD notes vaccines give mixed results because of the diversity of APEC serogroups — so colibacillosis is controlled overwhelmingly by management. The measures that matter, in roughly the order they pay off:

• Start with clean chicks and hatchery hygiene. Buy from a hatchery that keeps eggs and incubators clean, to avoid yolk-sac infection arriving with the chicks.
• Sanitise the water. Clean and flush drinker lines and tanks regularly, remove biofilm, and provide clean drinking water — one of the most cost-effective controls there is. Water hygiene is central to our water-quality guide.
• Fix the air and the litter. Ventilate well to keep ammonia and dust down, and keep litter dry and friable — this both removes E. coli's launch pad and stops the respiratory damage that lets it invade.
• Control the primary diseases. Vaccinate properly against Newcastle disease and infectious bronchitis and manage Mycoplasma, since these are the classic openers for E. coli.
• Manage stress and pests. Avoid overcrowding, chilling and overheating, brood chicks well, and keep rodents, flies and beetles out. Tight biosecurity and all-in-all-out management stop contamination building up between batches.

None of these is exotic or expensive; together they remove the conditions E. coli needs. A farm that keeps chicks clean, water clean, litter dry, air fresh and the primary diseases in check simply does not give colibacillosis the openings it depends on.

The bottom line on colibacillosis

Colibacillosis is the price poultry pay when E. coli — a bacterium already living in every house — is handed an opening. It rarely attacks a genuinely healthy, well-managed flock; instead it follows respiratory disease, wet litter, foul air, dirty water, hatchery contamination and stress, then shows up in many forms, from navel ill in chicks to airsacculitis in broilers and salpingitis in layers. Antibiotics help in a crisis but are undermined by heavy resistance and do nothing about the cause, so the disease keeps coming back until the trigger is fixed. The winning approach is unglamorous and entirely within your control: clean chicks, clean water, dry litter, fresh air, pest control and firm management of the primary diseases E. coli rides in behind. Close those doors and colibacillosis, for all its many faces, loses the opportunity it lives on.

Frequently asked questions

Sources & further reading

• MSD Veterinary Manual — Colibacillosis in Poultry (disease forms, opportunistic and APEC pathways, predisposing conditions, environmental risk factors, transmission, antibiotic resistance, prevention).
• Miles, Branton & Lott (2004), "Atmospheric ammonia is detrimental to the performance of modern commercial broilers," Poultry Science 83:1650–1654 (broiler body-weight loss at 50 and 75 ppm ammonia).
• Agro Prime Ghana guides: chronic respiratory disease (Mycoplasma), poultry house ventilation, water quality, poultry biosecurity, and responsible antibiotic use.