Avian Trichomoniasis (Canker): A Vet’s 2025 Guide 🐦🩺

By Dr Duncan Houston BVSc – avian veterinarian & founder of Ask A Vet 🩺🐾

Avian trichomoniasis—commonly called “canker” or “frounce”—is a protozoal infection caused by Trichomonas gallinae. While wild birds like pigeons, doves, finches, and raptors are most affected, pet birds—particularly budgerigars—can be infected via contaminated water, food, or feeding practices. This 2025 guide provides:

• 🔍 Symptoms and species at risk
• 🧪 Diagnostic techniques (wet mounts, imaging, cytology)
• 💊 Effective treatments: metronidazole, ronidazole, carnidazole
• 🌡 Supportive care and monitoring
• 🧼 Preventative hygiene and biosecurity
• 📱 How Ask A Vet can assist

1. 🦠 What Causes Trichomoniasis?

Avian trichomoniasis is caused by the flagellated protozoan Trichomonas gallinae (and related species like T. stableri and T. gypaetinii), which colonize the upper digestive and respiratory tracts of birds :contentReference[oaicite:3]{index=3}.

Transmission pathways include:

• Parent-to-chick regurgitation during feeding
• Contaminated water or feeders
• Predators ingesting infected prey birds :contentReference[oaicite:4]{index=4}

Protozoa survive only a few hours outside a host, so primary infection is rapid and often occurs via fresh water :contentReference[oaicite:5]{index=5}.

2. 🚩 Recognizing Symptoms

Clinical signs can vary, but common presentations include:

• White to yellow caseous plaques (“cheese-like cankers”) in the mouth, throat, crop, or esophagus :contentReference[oaicite:6]{index=6}
• Difficulty swallowing, regurgitation, drooling, foul breath :contentReference[oaicite:7]{index=7}
• Crop distention (especially in poultry), coughing, gaping
• Weight loss, lethargy, fluffed feathers, death within days in severe cases :contentReference[oaicite:8]{index=8}
• Rock pigeons and finches may exhibit neck swelling or eye/nasal discharge :contentReference[oaicite:9]{index=9}

3. 🔬 Diagnosis Techniques

Typical diagnostics include:

• Oral/crop wet-mount: observe live, pear-shaped flagellated trophozoites (5–20 µm) under light microscopy :contentReference[oaicite:10]{index=10}
• Cytology or impression smears: stained with Giemsa or Diff-Quik to locate organisms in lesions :contentReference[oaicite:11]{index=11}
• Culture: InPouch™ or specialized media for parasite propagation :contentReference[oaicite:12]{index=12}
• Gross exam: visible plaques often confirm diagnosis when combined with microscopy :contentReference[oaicite:13]{index=13}

4. 💊 Treatment Protocols

Nitroimidazoles are the gold standard:

• Metronidazole: 25–50 mg/kg PO every 12–24 hrs for 5–7 days—effective in most cases :contentReference[oaicite:14]{index=14}
• Carnidazole: 20–30 mg/kg PO for 1–2 days; rapid action in many gamebirds :contentReference[oaicite:15]{index=15}
• Ronidazole: 6–10 mg/kg/day PO for 7–14 days; common water-based treatment for pet birds :contentReference[oaicite:16]{index=16}

Follow-up testing after treatment helps ensure parasite eradication :contentReference[oaicite:17]{index=17}.

5. 🌡 Supportive Care

Alongside medication, focus on:

• Soft or soaked feed and syringe feeding if swallowing is painful
• Warm, stress-free environment for recovery
• Hydration support via electrolyte solutions
• Secondary antibiotics if lesions have caused bacterial infection :contentReference[oaicite:18]{index=18}
• Isolation to prevent spread within the flock

6. 🧼 Prevention & Biosecurity

Contain the infection and prevent recurrence by:

• Cleaning and disinfecting feeders, cages, baths daily :contentReference[oaicite:19]{index=19}
• Drying waterers to kill protozoa — they survive only while wet and fresh :contentReference[oaicite:20]{index=20}
• Quarantine new birds and test before mixing
• Remove sick birds to avoid carrier-to-newborn transmission
• Guard against wild bird contact — pigeon/dove visits often spark outbreaks :contentReference[oaicite:21]{index=21}

7. 📱 Ask A Vet Support

Use our app for:

• Photo-based lesion identification
• Dosing guidance and water medication instructions
• Advice on isolation, culture testing, and follow-ups
• Support for feeding protocols and provision of supportive measures

8. 🧠 Quick Reference Table

🧡 Final Takeaways

• Avian trichomoniasis is a treatable disease with quick parasite diagnosis and timely nitroimidazole therapy.
• Supportive care is vital for recovery and prevention of complications.
• Good hygiene, regular cleaning, and quarantine practices prevent spread and reinfection.
• Use Ask A Vet for tailored treatment guidance, follow-up support, and outbreak management.

For birds with oral lesions, weight loss, or swallowing difficulty—test early and begin treatment promptly. Reach out via the Ask A Vet app or visit AskAVet.com for expert support. Stay vigilant and keep your flock healthy in 2025! 🐾