Top Emerging Poultry Diseases to Watch Out for in 2026

H. A. Malkawi
May 16
3 min read

Poultry farming faces constant challenges from diseases that can rapidly affect flock health and farm profitability. As we approach 2026, new and evolving poultry diseases demand attention from farmers, veterinarians, and industry stakeholders. Staying informed about these emerging threats helps protect flocks, maintain production, and reduce economic losses. This article highlights the top poultry diseases expected to impact the industry in 2026, explaining their symptoms, transmission, and prevention strategies.

Close-up view of a chicken coop showing several birds with visible signs of illness — Signs of illness in poultry flock

Avian Influenza Variants

Avian influenza (AI) remains a major concern due to its ability to mutate and spread quickly among birds. In 2026, new variants of highly pathogenic avian influenza (HPAI) are expected to emerge, posing risks to both commercial and backyard flocks.

Symptoms: Sudden death, respiratory distress, swelling of the head and neck, decreased egg production.
Transmission: Direct contact with infected birds, contaminated equipment, wild birds.
Prevention: Strict biosecurity measures, controlling wild bird access, vaccination where available.

Recent outbreaks in Asia and Europe have shown that AI viruses can jump between species and regions, making global vigilance essential. Farmers should monitor flock health daily and report unusual deaths immediately.

Newcastle Disease Resurgence

Newcastle disease (ND) is a viral infection affecting the respiratory, nervous, and digestive systems of poultry. Although vaccination programs have controlled it in many areas, new strains resistant to current vaccines are emerging.

Symptoms: Coughing, sneezing, twisted neck, paralysis, sudden death.
Transmission: Aerosol droplets, contaminated feed, equipment, and human activity.
Prevention: Updated vaccination protocols, enhanced hygiene, and quarantine of new birds.

The resurgence of ND in some regions highlights the need for ongoing surveillance and vaccine development. Farmers should work closely with veterinarians to update vaccination schedules and biosecurity practices.

Eye-level view of a poultry farm worker inspecting chickens for signs of disease — Inspection of poultry flock for disease symptoms

Fowl Cholera with Antibiotic Resistance

Fowl cholera, caused by the bacterium Pasteurella multocida, causes severe illness and death in poultry. In 2026, antibiotic-resistant strains are becoming more common, complicating treatment efforts.

Symptoms: Swollen wattles, fever, diarrhea, sudden death.
Transmission: Direct contact with infected birds, contaminated water or feed.
Prevention: Improved sanitation, vaccination, prudent use of antibiotics.

Antibiotic resistance means farmers must rely more on prevention than treatment. Regular cleaning of waterers and feeders, controlling rodents, and isolating sick birds are critical steps.

Infectious Bronchitis Virus (IBV) Variants

Infectious bronchitis virus affects the respiratory tract and can reduce egg quality and production. New IBV variants with different genetic profiles are emerging, making control more difficult.

Symptoms: Coughing, sneezing, nasal discharge, decreased egg production.
Transmission: Aerosol droplets, contaminated equipment.
Prevention: Use of multivalent vaccines, strict biosecurity, and monitoring flock health.

Farmers should update vaccination programs to include coverage for new IBV strains and maintain good ventilation in poultry houses.

Coccidiosis with Drug-Resistant Strains

Coccidiosis, a parasitic disease caused by Eimeria species, affects the intestinal tract and is a leading cause of poor growth and mortality in poultry. Drug-resistant strains are increasingly reported.

Symptoms: Diarrhea, weight loss, lethargy, blood in droppings.
Transmission: Ingestion of oocysts from contaminated litter or feed.
Prevention: Rotation of anticoccidial drugs, use of vaccines, maintaining dry litter.

Managing litter moisture and hygiene reduces the risk of infection. Vaccination programs tailored to local Eimeria species can improve flock resistance.

High angle view of a poultry farm with clean and well-maintained housing facilities — Well-maintained poultry housing to prevent disease

What Poultry Farmers Should Do Now

Enhance biosecurity: Limit access to poultry houses, disinfect equipment, and control wild birds and rodents.
Update vaccination programs: Consult veterinarians to include vaccines for emerging strains.
Monitor flock health daily: Early detection of symptoms allows prompt action.
Practice good hygiene: Clean waterers, feeders, and housing regularly.
Use antibiotics responsibly: Avoid overuse to prevent resistance.
Stay informed: Follow updates from veterinary authorities and poultry health organizations.

By taking these steps, farmers can reduce the impact of emerging diseases and protect their flocks.