
Coccidiosis is a common and serious disease that affects backyard chicken flocks. It is caused by different species of coccidia, a parasite that attacks a chicken's digestive system. The parasite spreads quickly and can be deadly if left untreated. The key to treating coccidiosis is early detection, controlling the spread of the parasite, and providing appropriate medication. To prevent the disease, chicken keepers can purchase vaccinated birds or modulate the level of exposure to the parasite by maintaining good litter quality and bird density. Treatment options include anticoccidial drugs such as amprolium and sulfa drugs, as well as natural remedies like apple cider vinegar, garlic, and oregano.
| Characteristics | Values |
|---|---|
| Prevention | Vaccination, good management practices, maintaining ideal bird density, providing adequate bedding material, quarantining new birds, practising good bio-security, keeping waterfowl separate from chickens, avoiding throwing feed or treats on the ground |
| Symptoms | Runny and bloody poop, lethargy, pale comb, weakness, fatigue, loss of appetite, droopiness, depression, behavioural changes |
| Diagnosis | Fecal testing, post-mortem examination, fecal float test |
| Treatment | Amprolium, sulfa drugs (sulfamethazine, sulfadimethoxine, ormetoprim), ponazuril, apple cider vinegar, garlic, oregano, herbs, oils, Chicken E-lixir, other coccidiocidal drugs |
| Post-treatment | Vitamin B supplement, ensure clean environment |
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What You'll Learn

Isolate sick chickens
If one of your chickens is showing symptoms of coccidiosis, it is important to separate them from the rest of the flock to prevent the spread of the disease. This is because coccidiosis is a parasitic disease that can spread quickly and be deadly if left untreated.
When isolating sick chickens, it is important to put them in a clean, dry area with easy access to food and water. Coccidiosis is caused by coccidia parasites that invade the lining of a chicken's intestines, causing inflammation and poor nutrient absorption. The parasites are transmitted through faeces, contaminated food or water, and can multiply in warm, moist environments. Therefore, it is crucial to keep the isolation area clean and dry to prevent the further spread of the disease.
In addition to isolating sick chickens, it is important to consult a veterinarian for the right medication and dosage. Common treatments for coccidiosis include Amprolium, an anticoccidial drug that inhibits coccidia from multiplying, and Sulfa Drugs such as sulfamethazine and sulfadimethoxine, which are antibiotics for severe cases. It is also recommended to provide your chickens with a vitamin B supplement following treatment, as Amprolium interferes with the coccidia oocyst's ability to metabolise vitamin B.
To prevent coccidiosis in your flock, good management practices are key. This includes maintaining a low bird density to minimise the buildup of parasites in the litter, providing enough bedding material in the coop, and keeping the litter dry and fluffy to effectively dilute the faecal material. Early detection is also important, so it is recommended to look for subtle behavioural changes and other symptoms such as runny and bloody poop, lethargy, pale comb, weakness, fatigue, loss of appetite, droopiness and depression.
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Use medication
Coccidiosis is a serious disease caused by the coccidia parasite, which attacks a chicken's intestinal lining and digestive system. It is one of the most common diseases in backyard and commercial poultry flocks worldwide, and can be deadly if left untreated. The parasite spreads through faeces, contaminated food or water, and wild birds.
If you suspect your flock has coccidiosis, consult a veterinarian for advice. The vet will likely recommend medication such as the following:
- Amprolium: Amprolium is the most popular treatment for coccidiosis. It is an anticoccidial drug that blocks the parasite's ability to multiply. It is administered by adding it to the chickens' water supply. In some cases, the medication is given orally. Amprolium is commercially available and can be purchased without a veterinary prescription.
- Sulfa Drugs: Sulfamethazine and sulfadimethoxine are antibiotics used for severe cases of coccidiosis. Follow the recommended dosage and withdrawal period to ensure eggs and meat are safe for consumption.
- Other Anticoccidial Drugs: Monensin, salinomycin, lasalocid, narasin, and maduramicin are ionophores that affect both extra- and intracellular stages of the parasite. Ormetoprim is active against the protozoan enzyme dihydrofolate reductase and has synergistic activity with sulfonamides. Halofuginone hydrobromide is effective against asexual stages of most Eimeria species.
- Toltrazuril: Toltrazuril is another coccidiostat that can be used to treat coccidiosis. After finishing treatment with toltrazuril, help the chickens replenish vitamins in their bodies, as the treatment reduces their ability to absorb vitamin B.
In addition to medication, it is important to implement strong biosecurity measures and clean environmental conditions to prevent the spread of coccidiosis. Move feed and water bowls daily, and keep them away from roosting areas. Regularly clean water containers and feed bowls, removing all faecal droppings immediately.
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Vaccinate birds
Vaccination is one of the most effective ways to control coccidiosis in backyard chicken flocks. Most backyard chickens are not vaccinated, but it is easy to purchase vaccinated birds. Vaccines are typically administered on the day of hatch at the hatchery. Once the birds have developed immunity, they will be resistant to the strains of coccidia in the vaccine.
There are two main types of vaccines: attenuated and virulent. Attenuated vaccines have lower reproducibility and immunogenic potential, and are more expensive to produce. Virulent vaccines, on the other hand, may be anticoccidial-sensitive strains and may decrease the level of resistance in diverse coccidial populations. Live vaccines, which consist of non-attenuated and attenuated parasites, are also available. These vaccines generate a mild immune response when administered orally, and protection increases upon re-infection. However, live vaccines may cause severe reactions in birds and alter resistance in coccidial species. DNA vaccines are another option, offering the advantage of stability due to their structural and chemical composition.
To ensure the effectiveness of coccidiosis vaccination, it is important to follow certain guidelines. Firstly, food and water given before or after vaccination should not contain anticoccidials or other drugs with anticoccidial activity, as they can destroy the oocysts provided by the vaccine and prevent immunity development. Good sanitation is also crucial, as it reduces the chances of vaccinated birds being challenged by coccidial organisms. This includes removing litter and thoroughly cleaning houses between rearing cycles, as well as maintaining low bird density, controlling breeding practices, and reducing litter moisture.
It is important to note that immunity developed against one species of coccidia may not provide cross-protection against other species. Therefore, vaccines typically contain all the species considered pathogenic to poultry to provide broad protection. Additionally, the strains of coccidia in vaccines have shortened life cycles, which means they do not damage the bird's intestinal tissue. After vaccination, it is vital that birds continue to have access to their droppings, as this is where the oocysts sporulate to become infective under the right temperature and humidity conditions.
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Improve bedding and ventilation
Backyard chickens are often not vaccinated against coccidiosis, a common and potentially fatal disease. Therefore, it is important to manage the level of exposure to the parasite.
Coccidia parasites are transmitted through faeces, contaminated food or water. They thrive in warm, moist environments. Therefore, it is important to keep the chicken coop well-ventilated and dry to reduce humidity.
Make sure that your chickens always have access to clean water to reduce transmission. Change bedding often to minimise the accumulation of faeces and moisture. Keep the birds on a thick, dry layer of litter to dilute the faecal matter, reducing the number of coccidia parasites ingested during litter pecking.
Bird density is also important. Avoid overcrowding by ensuring that there is enough space per bird. The ideal bird density depends on the type of chicken, your circumstances, and setup. As long as the litter is kept in good condition (dry and fluffy), the density is likely fine. If the litter deteriorates too quickly, you probably have too many chickens for your setup.
To reduce the build-up of coccidia oocysts in the environment, rotate pastures or ranging areas for free-range flocks.
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Quarantine new birds
Quarantining new birds is an important step in preventing the introduction of coccidia and other diseases to your existing flock. Here are some detailed steps to properly quarantine new birds:
Distance and Separation:
Keep new birds at at least 10 metres away from your existing flock, as recommended by Agriculture Victoria. Freedom Ranger Hatcheries recommend a distance of at least 12 yards. This separation will help minimise the aerosol transfer of diseases and prevent direct contact with your main flock. Ensure that the quarantine area is inaccessible to predators such as foxes and rodents.
Feeding and Watering:
Use separate food and water dishes, as well as separate food storage containers, for the new birds. Always feed, clean, and handle the birds in the quarantine area after your main flock to prevent the transfer of diseases from the new birds to your existing flock. Provide the new birds with consistent food during and after the quarantine period to avoid digestive disturbances when they eventually join your main flock. Ensure that clean, fresh water is always available for the new birds.
Cage and Utensil Hygiene:
After the new birds have left the quarantine area, thoroughly clean the cage and feeding utensils. Scrub the entire cage, including the floor and wire, and then apply an appropriate disinfectant.
Parasite Examination:
Examine the new birds for external parasites such as lice, mites, and ticks, as these can cause stress and potentially carry diseases. If external parasites are detected, seek veterinary advice. It is also recommended to have the droppings of new birds examined for internal parasites such as coccidia and roundworms. Faecal testing can be done by sending the droppings to a laboratory for a faecal egg count. Testing should be conducted when the birds are first acquired, and again after two and six weeks, to increase the chances of detecting any issues.
Vaccination History:
Ask the seller about the vaccination history of the new birds. Vaccination can help prevent various diseases, including coccidiosis. Knowing the vaccination history will help you make informed decisions about future vaccination needs and potential disease risks.
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Frequently asked questions
Coccidiosis is a common and serious disease that affects chickens. It is caused by different species of coccidia, a parasite that attacks a chicken's digestive system. The parasite invades the lining of the chicken's intestines, causing inflammation and poor nutrient absorption. This can lead to fatal complications, especially in young chickens with no immunity.
Early detection is key. Symptoms of coccidiosis include runny and bloody poop, lethargy, pale comb, weakness, fatigue, loss of appetite, droopiness, and depression. If you suspect your chicken has coccidiosis, consult a veterinarian for the right medication and dosage. Common treatments include Amprolium, Sulfa Drugs, and coccidiocides. Amprolium is the most popular treatment and can be purchased over the counter. It is added to the chicken's water supply or administered orally.
Coccidia is transmitted through feces, contaminated food or water, and direct contact with infected birds. To prevent coccidia, practice good biosecurity and keep your chicken coop clean and dry. Avoid overcrowding and provide enough bedding material to reduce the chances of your chickens coming into contact with fecal matter. Quarantine new birds for at least two weeks before introducing them to your flock to prevent the spread of diseases.




















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