147. Infectious coryza of poultry.

Question 1

Occurrence ethiology and epidemiology?

Answer 1

OCCURRENCE, ETIOLOGY AND EPIDEMIOLOGY

• Worldwide occurrence, sporadic, more frequent in tropical countries
• Caused by Avibacterium paragallinarum A, B, C (Hemophilus paragallinarum)
• NAD and CO2 are needed for culture
• Virulence variants
• Low resistance, but survives in water
• Only hens are susceptible, Susceptibility increases with age
• Sudden appearance, fast spread in the whole flock, carried by recovered animals
• No germinative infection
• Predisposing factors are needed for infection (fac. Pathogen)
• Laying, infections

Question 2

Pathogenesis?

Answer 2

PATHOGENESIS

• Infection aerogenic or P.O.,
• if predisp. factors
• serous-fibrinous inflammation of the upper respiratory tract
• edema

Question 3

Clinical signs and pathology?

Answer 3

CLINICAL SIGNS AND PATHOLOGY

• Acute
• fever, depression, anorexia,
• nasal discharge, conjunctivitis, sinusitis,
• eye edema, labored breathing
• Chronic
• nasal discharge, sinusitis
• Pathology
• rhinitis,
• sinusitis (acute ʹ chronic),
• conjunctivitis,
• edema

Question 4

Treatment and prevention?

Answer 4

TREATMENT AND PREVENTION

• Antibiotics ʹ bacterium carriers remain
• Prevention of introduction
• Vaccines ʹ inactivated, at age of 6-10 weeks 2 times, serotype specific protection