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Coccidiosis in poultry

Coccidiosis is the most costly parasitic disease of poultry. Learn the signs (including bloody droppings), amprolium treatment, vaccines, and prevention.

Poultry coccidiosis is caused by several Eimeria species (such as E. tenella and E. acervulina), each targeting a different part of the gut. It is the most economically important parasitic disease in chickens worldwide.

Who is at risk

Young growing birds on litter are most at risk; warm, damp litter lets oocysts sporulate and spread through the flock.

Symptoms of coccidiosis in poultry

  • Bloody or watery droppings. Cecal coccidiosis (E. tenella) classically causes blood in the droppings.
  • Ruffled, huddled birds. Sick birds fluff up, huddle, and stop eating and drinking.
  • Drop in growth & production. Poor weight gain, pale birds, and lower egg output.
  • Sudden deaths. Heavy infections can kill young birds quickly.

When to act

Blood in the stool, ongoing diarrhea, dehydration, or a young bird going downhill all warrant prompt veterinary attention. Confirm the diagnosis with a fecal test rather than guessing.

Treatment

Effective options for poultry include:

  • Amprolium. The mainstay treatment, given in the drinking water for the flock for about 5 days.
  • Toltrazuril. Also used in water for treatment in some settings.
  • In-feed coccidiostats & vaccines. Prevention often relies on medicated feed or live coccidiosis vaccines in chicks.

Pair any treatment with supportive care — fluids, nutrition, and a clean, dry environment. The dosage reference shows typical published figures; a veterinarian must confirm what's right for your animal.

Talk to a vet about poultry

Coccidiosis should be confirmed with a fecal test, and several anti-coccidial drugs require a veterinarian's prescription. Vetr connects you with licensed veterinarians who can diagnose, advise, and prescribe when appropriate.

Talk to a licensed vet

Prevention

  • Keep litter dry and friable — wet litter is the number-one driver of outbreaks.
  • Avoid overcrowding and keep feeders and drinkers clean and off the litter.
  • Consider a coccidiosis vaccine or medicated (coccidiostat) feed for growing birds.
  • Practice all-in/all-out and clean between flocks.

Is it a risk to me or other animals?

Poultry Eimeria are host-specific to birds and do not infect humans or mammals.

Frequently asked questions

How do I treat coccidiosis in my flock?
Amprolium in the drinking water for about 5 days is the standard treatment. Because birds are usually medicated as a flock through the water rather than dosed individually, follow the product's water-mixing instructions and your vet's guidance.
Should I vaccinate or use medicated feed?
Both are valid prevention strategies. Live vaccines build immunity in chicks; in-feed coccidiostats suppress the parasite during the risk period. The best choice depends on your flock, and a poultry vet can help you decide.
Are bloody droppings always coccidiosis?
Blood in droppings strongly suggests cecal coccidiosis, but it isn't the only cause. Prompt treatment plus a proper diagnosis protects the rest of the flock.
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Questions about bird coccidiosis?

A licensed veterinarian can confirm the diagnosis and advise on the right approach for your bird. Vetr offers veterinary consultations.

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Educational information only — not veterinary advice, and not an offer to sell any product. Coccidiosis.com provides general educational information about animal health and does not diagnose, treat, or prescribe. Some medications discussed (including toltrazuril and diclazuril) are not approved by the U.S. FDA for use in animals, and others are approved only for specific species; any use must be determined and supervised by a licensed veterinarian, who can also advise on correct dosing and withdrawal times. Always consult your veterinarian before using any medication.