Infections from Haemophilus paragallinarum – now called Avibacterium paragallinarum - or Infectious Coryza in chickens can cause economic losses to poultry operations throughout the world. Coryza is a highly contagious respiratory disease, characterized by foamy conjunctivitis, sinusitis, nasal discharges, depression and lethargy. Affected flocks in lay can suffer drops in egg production from 5% to 10%, and in some cases, from 40% to total loss (100%) of eggs.

In broilers, the infection can lead to:

  • Airsaculitis, causing condemnations in the slaughter house
  • Association with and opportunities for Infectious Bronchitis and E. coli
  • Fibrinopurulent cellulitis on head and wattles

The disease can affect particularly meat bird operations where the birds are grown to an older age, like native chicken in Asian countries.

Sick birds can be treated with antibiotics, which should bring production levels back to normal. Antibiotics will not, however, eliminate the carrier birds, which harbor the bacteria and may disseminate it again under particularly stressing conditions.
Infectious Coryza vaccination programmes will not stop the birds from being infected. However, they lessen the signs of the disease and dramatically reduce shedding and spreading of the bacteria.

Vaccination programmes for layers and breeders usually consist of a two-dose regime. First vaccination, from 6 to 8 weeks of age (but sometimes as early as 4 weeks) protects pullets against the symptoms of Coryza infections in rearing facilities. A second vaccination at point of lay is recommended to re-enforce the immunity.

Vaccines against Infectious Coryza:

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