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Infectious Coryza

A highly infectious disease caused by Haemophilus paragallinarum is characterized by catarrhal inflammation of the upper respiratory tract.

Usually acute, sometimes chronic, infectious coryza primarily affects chickens and occasionally pheasants and guinea-fowl. Infected birds may spread the disease to the entire flock within 10 days.

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  • Infectious coryza symptoms include facial swelling, ocular and nasal discharge, swollen wattles, sneezing, decrease in egg production and loss of appetite.

  • To help prevent disease, bacterins may be utilized.  Vaccines are used in areas of high incidence.

  • Courses of treatment including streptomycin, dihydrostreptomycin, sulphonamides, tylosin and erythromycin have worked with varying degrees of success.



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