Poultry Flash - Infectious Coryza

Question 1

what are the only animals affected by infectious coryza?

Answer 1

chickens - most severe in young adults with high morbidity

Question 2

what is the classic case presentation of infectious coryza?

Answer 2

depression, inappetence, sneezing, conjunctivitis with adherence of eyelids, swollen infraorbital sinuses, facial edema

pneumonia & air sacculitis if complicated with secondary infection

Question 3

what is seen at necropsy from an animal with infectious coryza?

Answer 3

catarrhal or necrotizing sinusitis (infraorbital sinus contains caseous exudate), fibrinosuppurative conjunctivitis, & facial edema

Question 4

what is seen on microscopic exam of sinus exudates from chickens with infectious coryza? what about culture?

Answer 4

gram stain negative bipolar rod with a tendency to form filaments

microaerophilic, grows on blood agar, but requires nurse colony of s. aureus to secrete v-factor, & is catalase negative

Question 5

what tests are used to diagnose infectious coryza?

Answer 5

serology - hemagglutination inhibition & immunodiffusion tests

PCR

Question 6

how is infectious coryza treated?

Answer 6

supportive care & abx

Question 7

how is infectious coryza prevented?

Answer 7

depopulate carriers, vaccination, strict biosecurity & sanitation protocols

Question 8

how is infectious coryza transmitted?

Answer 8

direct contact, fomites, airborne, & contaminated food/water

Question 9

what animals serve as reservoirs for infectious coryza?

Answer 9

chronically ill/healthy carrier birds

Question 10

what is the causative agent of infectious coryza?

Answer 10

avibacterium (haemophilus) paragallinarum - microaerophilic gram negative bipolar rod that forms filaments