Infectious Laryngotracheitis in Chickens: Gasping, Bloody Mucus, and Emergency Signs
- See your vet immediately if a chicken is open-mouth breathing, stretching the neck to breathe, coughing up bloody mucus, or collapsing.
- Infectious laryngotracheitis, often called ILT, is a highly contagious herpesvirus infection that affects the upper airway and can spread through direct contact, contaminated equipment, litter, clothing, and short-range airborne exposure.
- Common signs include gasping, coughing, noisy breathing, conjunctivitis, watery eyes, nasal discharge, and a drop in egg production. Severe cases may sling blood-stained mucus onto walls or feeders.
- There is no home test that confirms ILT. Your vet may recommend flock exam, swabs for PCR testing, and sometimes tissue testing after death to confirm the cause and guide control steps.
- Typical 2026 U.S. veterinary cost range for a backyard flock workup is about $150-$700 for exam, flock guidance, and basic diagnostics, with outbreak PCR panels, necropsy, or state lab testing potentially increasing total costs.
What Is Infectious Laryngotracheitis in Chickens?
See your vet immediately if your chicken is gasping, coughing up blood-tinged mucus, or struggling to move air. Infectious laryngotracheitis, or ILT, is a highly contagious viral respiratory disease caused by gallid alphaherpesvirus 1. It mainly affects chickens, though other birds such as pheasants and peafowl can also be involved.
ILT targets the larynx, trachea, and nearby tissues of the upper airway. In severe cases, inflammation and thick mucus can make breathing very hard. That is why some chickens stand with the neck extended, breathe with the mouth open, or cough up bloody material. In milder cases, signs may look more like conjunctivitis, watery eyes, nasal discharge, and noisy breathing.
One challenge with ILT is that birds that survive can remain latent carriers of the virus. That means the virus may stay in the flock and reactivate later, especially during stress. For pet parents with backyard chickens, this makes fast veterinary guidance, isolation, and strong flock biosecurity especially important.
Symptoms of Infectious Laryngotracheitis in Chickens
- Open-mouth breathing or gasping
- Coughing, choking, or head shaking
- Bloody mucus from the mouth or beak
- Noisy breathing, rattling, or rales
- Neck stretching to breathe
- Watery eyes, conjunctivitis, or swollen eyelids
- Nasal discharge
- Drop in egg production
- Lethargy, reduced appetite, or isolation from the flock
- Sudden death in severe outbreaks
The most concerning signs are gasping, bloody mucus, severe coughing, blue or dark comb color, collapse, or sudden deaths. Those signs can mean the airway is becoming blocked and the bird needs urgent veterinary attention. Even if only one chicken looks sick, the whole flock may have been exposed.
Respiratory signs in chickens can overlap with other serious diseases, including avian influenza, Newcastle disease, infectious bronchitis, mycoplasma infections, and infectious coryza. Because of that, any flock with significant breathing trouble should be treated as a veterinary and biosecurity concern until your vet helps sort out the cause.
What Causes Infectious Laryngotracheitis in Chickens?
ILT is caused by infectious laryngotracheitis virus, a herpesvirus spread mainly by contact with infected chickens and contaminated items. Shared feeders, waterers, crates, litter, boots, clothing, and hands can all move virus from one bird or flock to another. In some settings, the virus can also spread through the air over short distances between nearby groups of birds.
Backyard flocks are often exposed when new birds are added without quarantine, birds return from swaps or shows, or equipment is borrowed between flocks. Recovered birds may continue to carry the virus silently and can shed it again later. That is one reason outbreaks can seem to appear suddenly.
Vaccination may be part of control plans in some regions, but it is not a one-size-fits-all choice for backyard chickens. Some live ILT vaccines can spread to non-vaccinated birds, so vaccine decisions should be made with your vet and, when needed, state animal health guidance. Good biosecurity remains a core part of prevention whether a flock is vaccinated or not.
How Is Infectious Laryngotracheitis in Chickens Diagnosed?
Your vet will start with the flock history, how quickly signs appeared, whether any new birds were introduced, and what the breathing sounds and eye changes look like. Because ILT can resemble several other poultry diseases, symptoms alone are not enough to confirm it.
Confirmation usually relies on PCR testing of appropriate samples and, in some cases, histopathology. Tissue from the trachea, larynx, or conjunctiva may show characteristic microscopic changes, including syncytia and intranuclear inclusion bodies. If a bird dies, your vet may recommend necropsy and laboratory submission, which can be one of the fastest ways to get a useful answer for the rest of the flock.
Testing also matters for flock management. A confirmed diagnosis helps your vet discuss isolation, supportive care, whether secondary bacterial infection is a concern, what to do about exposed birds, and whether local reporting or additional disease rule-outs are needed.
Treatment Options for Infectious Laryngotracheitis in Chickens
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Urgent call or exam with your vet for triage
- Immediate isolation of visibly sick birds
- Warm, clean, low-dust housing with easy access to water and feed
- Basic supportive care plan for hydration, stress reduction, and monitoring
- Biosecurity steps for boots, clothing, feeders, and traffic control
- Discussion of whether humane euthanasia is appropriate for birds in severe respiratory distress
Recommended Standard Treatment
- Hands-on veterinary exam and flock history review
- PCR testing on swabs or submitted samples to confirm ILT
- Necropsy or state diagnostic lab submission if a bird has died
- Supportive care instructions for affected and exposed birds
- Assessment for secondary bacterial complications and discussion of treatment options through your vet
- Written isolation, cleaning, and quarantine plan for the flock
Advanced / Critical Care
- Emergency stabilization for birds in marked respiratory distress
- Hospitalization or intensive monitoring when available for poultry patients
- Expanded diagnostic testing to rule out other major respiratory diseases
- Flock-level consultation with diagnostic lab or state animal health input when indicated
- Detailed outbreak management planning, including carrier risk, long-term segregation, depopulation discussions in severe situations, or vaccination strategy review where appropriate
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Infectious Laryngotracheitis in Chickens
Bring these questions to your vet appointment to get the most out of your visit.
- Do my chickens' signs fit ILT, or do we also need to rule out avian influenza, Newcastle disease, mycoplasma, or infectious bronchitis?
- Which birds should be isolated right now, and how long should quarantine last for exposed birds?
- What samples should we submit for PCR or necropsy, and which lab is best for backyard poultry testing in my area?
- Are any of my birds in immediate airway danger, and what signs mean I should seek emergency help today?
- Could secondary bacterial infection be making this worse, and what treatment options make sense for my flock?
- If a bird recovers, could it remain a carrier and continue to put the flock at risk?
- Is ILT vaccination appropriate for my flock, or would it create more risk than benefit in my setup?
- What cleaning, disinfection, and visitor rules should I start today to reduce spread?
How to Prevent Infectious Laryngotracheitis in Chickens
Prevention starts with biosecurity every day, not only during an outbreak. Keep new birds separate before introducing them to your flock, avoid sharing equipment with other chicken keepers, and clean and disinfect boots, crates, feeders, and waterers regularly. Limit visitors who have contact with poultry, and wash hands before and after handling birds.
It also helps to reduce contact with outside disease sources. Keep feed protected from wild birds and rodents, use dedicated footwear in poultry areas, and separate sick birds right away. If you attend swaps, shows, or community poultry events, change clothes and footwear before returning to your coop.
Vaccination can be part of prevention in some flocks, but it should be discussed with your vet rather than used automatically. VCA notes that live ILT vaccine is generally not recommended for many backyard flocks because vaccine virus can spread to non-vaccinated chickens. For many pet parents, the most practical prevention plan is a combination of quarantine, sanitation, traffic control, and fast veterinary attention for any respiratory signs.