Infectious coryza vaccines
Infectious coryza is a bacterial respiratory disease of chickens caused by Avibacterium paragallinarum. It spreads quickly through a flock, causing swollen faces, foul-smelling nasal discharge and sharp drops in egg production. Recovered birds can remain carriers, so inactivated vaccines covering serotypes A, B and C are used in layers and breeders.
Signs to watch for
- Swelling of the face and around the eyes
- Thick, foul-smelling nasal discharge
- Sneezing and watery eyes
- Drop in feed intake and egg production
Which birds are at risk?
Growing pullets, layers and breeders, especially on multi-age farms.
How vaccination protects your flock
Inactivated (oil-adjuvanted) coryza vaccines are injected, usually twice during rearing before the start of lay. All-in, all-out management and avoiding carrier birds help control the disease. Antibiotic treatment of outbreaks should only be done on veterinary advice.
Infectious Coryza vaccines from Shiv Sales
Inactivated vaccines against Avibacterium paragallinarum, protecting layers and breeders from coryza.
Infectious Coryza: common questions
What causes swollen face in chickens?
Infectious coryza is a common cause, but swollen heads can also come from other infections such as mycoplasma, avian metapneumovirus or E. coli. A vet should confirm the cause.
How many doses of coryza vaccine are needed?
Typically two doses during rearing, a few weeks apart, before lay — follow the manufacturer's schedule.
Can coryza spread through carrier birds?
Yes. Recovered birds can carry the bacteria, so mixing ages or bringing in birds of unknown health is risky.
Related guide
Biosecurity basics for every poultry farm
Vaccines protect birds that are exposed to disease. Biosecurity reduces how often they are exposed in the first place — and it costs far less than an outbreak.
Read articleCommon chicken diseases and their vaccines
Signs, affected ages and vaccines for the 12 most important poultry diseases.
Open guideOther vaccines
This page is general information for farmers and does not replace veterinary advice. Always follow the vaccine manufacturer's instructions.
Need help choosing the right vaccines?
Talk to our team for a vaccination schedule built around your flock, location and disease pressure. Consultation is free for customers.