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What is Yeast Infection?

There are two types of yeast infection; acute, which is sudden and moves fast, and chronic, which happens over a long period of time. It is difficult to treat yeast infections in birds because of the close contact of large flocks and since the route of transmission is through bird droppings, which are everywhere.

Yeast infection, or candidiasis is an extremely dangerous fungal infection that birds get secondary to an infection or disorder of the crop or from antibiotic treatment. This illness affects young birds, geese, ducks, ibis, quails, turkeys, ostriches, canaries, finches, budgies, and other psittacines. Birds that have systemic diseases such as avian chlamydiosis and mycobacteriosis are more susceptible to yeast infection as well. However, this infection can be found in a bird of any age, breed, or sex. Since this is such a highly contagious fungus, yeast infections almost always affect all chicks in the clutch and will spread rapidly throughout the flock. Some of the symptoms it produces include diarrhea and regurgitation, progressing to chronic wasting and death.

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Symptoms of Yeast Infection in Birds

This infection is almost always chronic and does not usually show symptoms until long after it has begun. However, over a period of 12-18 months you may notice certain gradual changes in your bird. In acute cases, the signs will come on quickly and be fatal within 24 hours. Some of these signs include:

  • Lack of appetite
  • Weight loss
  • Regurgitation
  • Ruffled feathers
  • Crop stasis (slow digestion, swollen crop)
  • Listlessness
  • Agitation
  • Diarrhea
  • Depression
  • White throat
  • Plaques in mouth (usually white or red)


  • Chronic cases are gradual and more common in all other birds
  • Acute cases are most often seen in parakeets (budgerigars) and are commonly fatal within 12-24 hours

Causes of Yeast Infection in Birds

The cause of yeast infections in birds is Macrorhabdus ornithogaster, which is fungi that attacks the gastrointestinal system. This fungus colonizes the digestive tract (proventriculus) and elevates the pH to alter the stomach and disrupt the koilin layer. Koilin is a combination of carbohydrates and proteins that is secreted by the mucosal glands. Without this product, the gizzard is left unprotected and cannot aid in digestion as it should.

Diagnosis of Yeast Infection in Birds

Because this infection spreads so fast and the symptoms are so slow, you will probably not notice the condition until your whole flock is infected. In these situations, it is best to have the veterinarian come to you rather than taking one or more of your sick birds to the office where it may spread the infection. However, you should call your veterinarian for advice on what is best. Yeast infections can be found in feces specimens or periventricular scrapings stained with Wright, Diff-Quik, Leishman, or Giemsa preparations. Barium sulfate contrast x-rays will show a sandglass shaped retraction between the gizzard and the crop.

A serum chemistry test can check the values of many different types of chemicals, but the most common in birds include uric acid, total protein, calcium, phosphorus, glucose, aspartate transaminase (AST), and bile acids. A complete blood count (CBC) is used to determine the amounts of red blood cells, white blood cells, platelets, and reticulocytes in the blood. Using these tests, the veterinarian will be looking for signs of thrombocytosis, basophilia, monocytosis, and lymphocytosis.

Treatment of Yeast Infection in Birds

Unfortunately, it can be very difficult to treat yeast infections in birds because the fungi are able to build up a resistance to the antifungal medication fairly quick. The amount of time that it takes to treat the infections, which is approximately four to six weeks, give the organisms time to become resistant in many cases.


Some of the drugs used in treating yeast infections include itraconazole, fluconazole, ketoconazole, flucytosine, and nystatin. These are usually given orally with an epigastric tube leading down your bird’s throat to the stomach. The medication must be given two times per day for 30 to 45 days. In cases of oral or topical infections, a cream or ointment of amphotericin can be used. The drugs used may need to be changed if one stops working during treatment or if it goes away and comes back.

Recovery of Yeast Infection in Birds

Treating a large flock is not usually successful, but it is possible to do by using 10 milligrams of chlorhexidine per gallon of water for three weeks. The prognosis is guarded due to the length of time it takes for symptoms to be noticed. By the time it is noticed, it has usually done permanent damage to the gastrointestinal system and has spread to the rest of the flock. Your best hope is to get treatment as soon as you suspect a yeast infection.

Yeast Infection Questions and Advice from Veterinary Professionals

Budgerigar Budgerigars
7 Months
Fair condition
0 found helpful
Fair condition

Has Symptoms

Scratching neck with foot
Yawning Constantly

I have a small budgie and she is constantly yawning (about 9 times in a row). She is also scratching her neck with her foot while yawning. I read this means she has yeast infection somewhere. Can you confirm?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2137 Recommendations
Budgies may yawn for a variety of reasons including the same reasons as humans; however, it may also be an indicator of foreign objects, infections, parasites and other issues. If Sky is scratching at her neck, I would be concerned about a possible foreign object; but without examining Sky I cannot give you any specific indication. Regards Dr Callum Turner DVM

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Cockatiel Species
< 1 year
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

not active
Feasces not usual colour
Feather plucking
Rubbing Face

Hello Doctor,

I have a cockatiel and he has been plucking his feathers continually for weeks now. I took him to the vet some weeks back and they gave me an ointment called Surfaz-Nz to put on the places where he had plucked too much. However, it did not work. Yesterday I noticed he was sleeping more than usual at the bottom of the cage. I again took him to his vet and they gave me a powder and two pills to crush and administer to him. I had to dissolve it in 5ml of water and give 1ml daily for 5 days. However, this morning I noticed two white spots on his head top and he continually is rubbing his head everywhere he can. He is today again sleeping on his perch and not very active and joyful as usual. Can you please tell me what to do as I am very worried regarding his conditions.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2137 Recommendations
Common causes for feather plucking include boredom, fungal infections, parasites, nutritional deficiencies among other causes; it is important that Vinch is fed a complete diet and is suitable for him. It would be best to find an Avian Veterinarian (Specialist) to take a look at Vinch as I am not sure what the specific cause is but I am suspecting a fungal infection. Regards Dr Callum Turner DVM

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Yellow-Rumped Warbler
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

Does not eat or drink
Cannot/Does not stand on her own
Excessive Saliva

The bird I have is a wild bird. I brought her into my room after I found her outside in the freezing rain. I wash my hands before and after I have contact with her. I have grown attached to her and I do not have the money to buy medicine or to go see a vet.

She was perfectly fine the day before, but now she's salivating excessively. She use to fly around and play with things on my desk and eat and drink normally, but now she sits in one spot and does not move, eat or drink. And when I hold her in my hand she does not stand on her feet.

Is there something I could do for her that does not require medicine or veterinary help?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2137 Recommendations
It sounds like a yeast infection, but without an examination I cannot say for sure; there are various products available in pet shops but these vary according to your location. Apart from that, you should ensure that Byers has a balanced diet suitable for the species. Regards Dr Callum Turner DVM

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