Trichomoniasis in pigeons
Pigeon trichomoniasis, also called "false membrane" or "yellow beak" by breeders, is a common parasitic disease in domestic pigeons. It is caused by a small single-celled parasite, Trichomonas gallinae, which settles in the bird's mouth, th...
What is it?
Pigeon trichomoniasis, also called "false membrane" or "yellow beak" by breeders, is a common parasitic disease in domestic pigeons. It is caused by a small single-celled parasite, Trichomonas gallinae, which settles in the bird's mouth, throat, and sometimes crop. This disease mainly affects young pigeons, particularly squabs fed by parents carrying the parasite. It is very widespread in breeding operations and pigeon lofts, including in Tunisia, because the parasite is easily transmitted during feeding.
Key point
In young squabs, severe forms can be fatal if not managed quickly.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Affected pigeons often show yellowish or whitish deposits, somewhat like cheese, at the back of the mouth, in the throat, or sometimes on the crop. These deposits can interfere with breathing or swallowing.
The bird eats less, loses weight and becomes lethargic, with ruffled feathers.
It may drool, have difficulty swallowing, regurgitate its food, and display foul-smelling breath.
In young squabs, growth may be slowed and mortality can be significant in cases of severe infection, particularly if the lesions block the digestive or respiratory pathways.
Some adult birds are carriers without showing any visible signs.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by a protozoan (single-celled parasite) called Trichomonas gallinae. This parasite normally lives in the mouth and crop of many pigeons without causing symptoms. Under certain conditions – young age, stress, weakened immune system, or concurrent illness – it can multiply rapidly and cause lesions.
Unweaned squabs fed by carrier parents are most at risk. Overcrowding in the dovecote, inadequate water and feeder sanitation, and general weakening of the bird from stress, other infections, or malnutrition increase the likelihood of disease.
Transmission
The parasite is transmitted mainly during feeding of squabs by infected parent birds, as food is regurgitated directly into the young birds' beaks. It can also be transmitted between adults when drinking from water contaminated by infected oral secretions, or through direct beak-to-beak contact.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian examines the bird's mouth and throat for the characteristic deposits. A diagnosis can be confirmed by taking a sample of oral secretions to view under the microscope, where the motile parasite is directly visible. In some cases, additional tests are performed to rule out other diseases that can cause similar mouth lesions, such as avian pox or vitamin A deficiency.
Treatment
Treatment relies on antiparasitic drugs effective against protozoa, prescribed by the veterinarian. In cases of extensive lesions, supportive care such as rehydration and feeding assistance may be needed. Cleaning and disinfection of the dovecote routinely accompany treatment of the birds to prevent reinfection.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Good dovecote hygiene is essential: regular cleaning of drinkers and feeders, frequent water changes.
Avoid overcrowding in dovecotes.
Isolate and have examined any bird showing suspicious signs before it infects the rest of the group.
Regular veterinary monitoring of the flock allows detection of asymptomatic carriers.
Possible complications
Without treatment, mouth lesions can enlarge and obstruct the passage of food or air, leading to severe weight loss, dehydration, and sometimes death, especially in young squabs. The parasite may also spread to the liver or sinuses in the most severe forms.
When to see a veterinarian
The bird has yellow or whitish deposits in the beak or throat
It is eating less or refusing food
It is drooling, regurgitating, or appears to have difficulty swallowing
A young pigeon has slowed growth or remains stunted
Several birds in the same loft show similar signs
Prognosis
The prognosis is good if the disease is detected and treated early, with complete recovery in most cases. It becomes more guarded in very weakened young pigeons or when lesions are extensive and long-standing, potentially leading to death if left untreated.
Frequently asked questions
Can trichomonosis in pigeons be transmitted to humans?
No, Trichomonas gallinae is specific to birds and is not transmitted to humans.
Can an adult pigeon without symptoms transmit the disease?
Yes, many adults are healthy carriers of the parasite and transmit it to their young during feeding without being sick themselves.
Should the entire pigeon loft be isolated if there is a suspected case?
It is advisable to isolate the sick bird and have the other pigeons examined by a veterinarian, as transmission within the same group is common.
Are deposits in the beak always due to trichomoniasis?
No, other diseases such as avian pox or vitamin A deficiency can cause similar lesions; only a veterinary examination can tell the difference.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
AVMA — American Veterinary Medical Association
Content reviewed by the TunisieVet editorial team · Updated 27 August 2026
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