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Exotic bird/Poultry Diseases

Terms in this set (17)

a. Pathogen characteristics:
i. Lentogenic form is slow & avirulent
ii. Mesogenic form is medium seed & sometimes virulent
iii. Velogenic form is FAST & virulent (called END because this disease marks the end of the chicken's life!)
1. Viscerotropic & neurotropic forms
2. We don't have this here in the US
iv. $$$$$$$$$$$$ lost
b. Clinical signs: vary based on virus type/tropism & host immune status
i. Velogenic
1. Viscerotropic → hemorrhagic necrosis (like in trachea), respiratory signs (gasping & rales), edema of head/neck, conjunctivitis & ocular schmoo, green diarrhea, GI signs, anemia
2. Neurotropic → respiratory distress, neuro signs (necrosis of glial cells, neuronal degeneration, perivascular cuffing, hypertrophy of endothelial cells) like wing/leg paralysis, torticollis, muscle spasms
ii. Wild birds can be asymptomatic carriers
iii. Zoonotic (creepy self limiting conjunctivitis)
c. Pathogenesis: varies, replicates in epithelial cells of upper respiratory tract & GIT → viremia to spread throughout body (cytotoxic)
d. Transmission: inhalation, ingestion, or fomites (people who brought their birds to cock fights & then went back to work at poultry commercial operations)
i. Virus shed in all secretions/excretions (how lovely!), shedding starts 2-3 days after exposure & goes on for weeks
ii. Stable in environment (carcass of affected bird, feed, water, fomites)
e. Diagnosis: characteristic clinical signs & lesions; virus isolation (embryonated egg), ELISA, HI, real time PCR
f. Prevention: clean the litter, separate infected from healthy birds

Name the disease condition & the causative agent