Gapeworm is an important health concern for chicken keepers. Understanding its signs, causes, and management strategies is essential for maintaining a healthy flock.
What it looks like
Birds with this condition may display one or more of the following signs:
Gasping for breath (gaping) (Throat and beak): Bird opens beak wide repeatedly, gasps for air like drowning on land — the signature sign of gapeworm
Head shaking or jerking (Neck and head): Bird suddenly shakes or jerks its head as if trying to dislodge something from throat
Rattling or wheezing sounds from throat (Respiratory tract): Audible struggling or crackling sound when bird breathes
Loss of appetite and weight loss (General body condition): Bird eats little, becomes thin and weak from respiratory distress
Coughing or expectoration (coughing up blood or worms) (Throat and beak): Bird may cough or expel worms or bloody mucus from mouth
Extreme lethargy (General behavior): Bird sits motionless, closes eyes, barely moves
Likely causes
This condition can arise from multiple sources:
- Infection with Syngamus trachea (the gapeworm), a parasitic nematode that attaches to the trachea
- Ingestion of contaminated soil, vegetation, or food where worm eggs survive
- Infection of earthworms, slugs, or snails (intermediate hosts) that birds eat
- Young birds (chicks and pullets) are more susceptible than adults
- Poor sanitation and muddy, wet environments favor worm survival
What to do
Remove the bird to a quiet area and allow it to rest (stress worsens breathing). If you see a worm protruding from the trachea, it can sometimes be carefully removed with tweezers (extremely gently, to avoid damaging tissue). Use anthelmintic medications (deworming agents like fenbendazole or levamisole, per veterinary dosing). Some keepers use Neguvon spray on the head/throat area (follow label carefully). Supportive care: keep the bird warm, hydrated, and in a low-dust environment.
Monitor affected birds closely for improvement or worsening signs. Provide supportive care including clean water, nutritious feed, and comfortable housing. Isolate severely affected birds to prevent stress-induced spread to other flock members.
When to see a vet
See a vet if multiple birds are affected, if signs are severe, or if the bird doesn’t improve within a few days of treatment. Early intervention can prevent spread through your flock.
Prevention
Rotate pasture regularly to prevent worm buildup in soil. Keep coops dry and clean. Reduce access to contaminated earthworms, slugs, and snails. Treat all birds prophylactically with dewormer during high-risk seasons. Quarantine new birds before introducing to flock. Maintain good biosecurity.
Provide fresh water daily, ensure adequate nutrition, and minimize stress through consistent handling and stable environmental conditions. Regular coop cleaning and disinfection reduce disease-carrying organisms in the environment.
Frequently asked questions
Can I see gapeworms in my bird’s mouth or throat?
Yes, sometimes. Mature gapeworms are Y-shaped and red (1–2 cm long), and they may protrude slightly from the trachea opening at the back of the throat. If you see one, do not pull hard — gently remove it with clean tweezers, or contact a vet.
How do chickens get gapeworms?
Chickens eat contaminated soil or earthworms/slugs that carry worm larvae. The worms develop in the bird’s trachea over 10–14 days. Young birds outdoors in damp conditions are at highest risk.
Will my flock catch gapeworms from one infected bird?
Yes, gapeworms are contagious. Infected birds shed eggs in droppings; other birds ingest contaminated food/soil and become infected. Isolate the sick bird and treat all birds in the flock prophylactically with dewormer.
Can gapeworms be prevented completely?
Complete prevention is difficult if birds have outdoor access, but good sanitation, regular deworming, and pasture rotation greatly reduce risk. Keep coops dry and rotate outdoor areas frequently.