Causes and symptoms of infectious laryngotracheitis in chickens
Release time:
Dec 29,2018
Causes of infectious laryngotracheitis in chickens
Infectious laryngotracheitis is an acute, contact upper respiratory tract infectious disease caused by infectious laryngotracheitis virus. It is characterized by dyspnea, coughing, and coughing up exudate containing a blood sample. At autopsy, swelling, bleeding and erosion of the larynx and tracheal mucosa were seen. In the early stage of the disease, the affected cells can form intranuclear inclusion bodies. The disease spreads rapidly, occurs and prevails in many areas of China, and harms the development of chicken industry.
Symptoms of infectious laryngotracheitis in chickens
Early onset
The incubation period of natural infection is 6-12 days, and chickens can get sick 2-4 days after artificial trachea inoculation. The length of the incubation period is related to the virulence of the virus strain.
At the beginning of the disease, several sick chickens often die suddenly. The initial stage of the chicken with nasal fluid, translucent, eye tears, accompanied by conjunctivitis, followed by the performance of the characteristics
Respiratory symptoms, moist rales when breathing, cough, wheezing, sick chickens crouching on the ground or perch, each time the head and neck forward upward, mouth, try to inhale posture, there is wheezing. In severe cases, high dyspnea, convulsive cough, bloody mucus may be coughed up, and the beak corners, face, and head feathers may be contaminated. Blood stains on coop walls, bedding, cages, chicken back feathers, or adjacent chickens. If the secretions cannot be coughed up and blocked, the sick chicken can suffocate to death. Sick chicken appetite to reduce or disappear, rapid emaciation, cockscomb hair wisdom: sometimes discharge green thin feces. In the end, many died of failure.
pathogenesis process
Course of disease: The most acute cases can die in about 24 hours, most of which are 5-10 days or longer. The undead recover after 8-10 days, and some can become poisoned chickens. When some virulent strains cause the disease, the epidemic is relatively mild, the incidence is low, the symptoms are mild, but listlessness, slow growth, reduced egg production, conjunctivitis, suborbital sinusitis, rhinitis and tracheitis. The disease course is longer, the mortality rate is generally low (2%), and most sick chickens can tolerate it. If there are secondary bacterial infections and stress factors, mortality will increase.
Previous article
More content
A
This 2026 authoritative guide from ANCHEE GROUP breaks down the core framework of accurate nutrition for eggs and poultry, citing latest industry research and real farm case data. It covers stage-specific nutrient formulas, cost optimization tips, common misconceptions and practical implementation steps to help poultry farmers and feed producers maximize return on investment without compromising egg quality.
A
This full guide built on ANCHEE GROUP’s 15+ years of poultry nutrition solution expertise (serving over 3,200 farms across 28 countries) breaks down all core rules of accurate nutrition for eggs and poultry, integrating 2026 latest field test data, peer-reviewed agricultural research, and real farm case insights. It delivers actionable workflows, reference tables and Q&A to help producers cut feeding cost and improve overall output efficiency.
A
This guide breaks down accurate nutrition for eggs and poultry combining ANCHEE GROUP’s 14 years of hands-on poultry farming experience, latest 2026 research and field test results. It covers stage-specific nutrient standards, error correction tactics, ROI calculation and targeted solutions for small family farms and large commercial breeding operations.
A
This 2026 guide from ANCHEE GROUP (en.anchee.com) covers all core dimensions of accurate nutrition for eggs and poultry, including stage-specific nutrient requirements, common feed formulation pitfalls, test-verified performance data, and actionable operational steps. It integrates latest industry research and 1000+ real farm case data to help poultry farmers and feed formulators maximize egg output and animal health without unnecessary extra cost.
A
This 2026 practical guide based on ANCHEE GROUP’s 12+ years of poultry farm operation experience breaks down core rules of accurate nutrition for eggs and poultry. It covers stage-specific nutrient demands, common formulation mistakes, and step-by-step implementation tips to help farms raise production efficiency by 27% on average per our 2026 field tracking data.
ANCHEE GROUP
TelPhone: 86-531-88771588
Fax: 86-531-88771898
E-mail: ac@anchee.com
Office address: Floor 25, Building 5, Lushang Guoao City, Lixia District, Jinan City, Shandong Province
