Poultry diseases #2

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Poultry diseases #2
2015-09-21 22:36:05
Poultry diseases

Poultry diseases #2
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  1. what are 3 primary lymphoid tissues?
    • Bursa of fabricius
    • Thymus
    • Bone marrow
  2. 2 types of respiratory associated lymphoid tissue?
    • BAL
    • TAL
  3. In birds a major GIT lymphoid point is?
    Cecal tonsils
  4. 4 reasons for atrophy of lymphoid tissues?
    • Stress and apoptosis - glucocorticoid release
    • Nutrition - Zn, vit A or E/Se deficiencies
    • Mycotoxins - ¬†aflatoxin, ochratoxin
    • Immunosuppresive
  5. What is gumboro disease?
    Infectious bursal disease
  6. IBD only seen in? what age? chronic or acute?
    • Chickens
    • 3-6 weeks old
    • acute and contagious
  7. What do we see happen to the bursa in IBD?
    Edematous, hemorrhagic, atrophy etc
  8. Lesions seen not associated with the bursa in IBD
    • Vent picking
    • Incoordination
    • dehydration
    • Hemorrhage in thigh and pectoral mucles at the junction of proventriculus and gizzard
  9. IBD high morbidity or mortality
  10. Big impact of IBD
    • Immunosuppression
    • gangrenous dermatitis, e. coli, inclusion body hepatitis, vaccination failures
  11. 2 strains of IBD
    • Classical - atrophy and immunosuppresion
    • Highly virulent - everywhere in world but Canada, hemmorrhagic necrotizing bursal lesions
  12. IBD serotype 1 has how many subtypes, which is non pathogenic
    • 6
    • 2
  13. How is IBD transmitted?
    Only horizontal, very peristant in barns, very resistant to disinfection
  14. If you have a plate of bursas how can you tell if it is IBD
    • Heterogenous small bursas compared to normal
    • On histo looks atrophied
  15. Why do we need to wait till later to vaccinate birds for IBD?
    Maternal antibodies protect for 3-4 weeks
  16. Do IBD vaccines cross protect against other serotypes
  17. Why is it so important to vaccinate parent stock when laying eggs?
    • Passive immunity is passed down
    • vaccinate multiple times to keep titre up
  18. When vaccinating for IBD we prime with ____ and boost with _____
    • Live
    • killed
  19. Chicken infectious anemia is what kind of virus?
  20. CIA causes?
    • Aplastic anemia
    • lymphoid depletion
    • Sub Q and IM hemorrhage
    • immunosuppression
  21. What ages are susceptible to CIA
    All ages
  22. WHat is PCV with a CIA affected bird?
  23. Is CIA virus easy to destroy
  24. What is a complication of CIA crossing voer with other dieases?
    Early infection can interfere with other vaccines
  25. CIA mortality
  26. How can chicken infectious anemia make mareks and IBD more likely?
    Interfere with vaccination
  27. Describe some lesions of chicken infectious anemia
    • Thymic atrophy
    • Fatty yellow bone
    • bursal atrophy
    • Hemorrage in sub Q
  28. Common secondary bacterial disease to CIA?
    Gangrenous dermatitis (blue wing disease)
  29. How is CIA transmitted?
    Horizontally and vertically
  30. With chicken infectious anemia do all birds that transmit the disease have to be Antibody positive?
  31. Why do we see petechiation with Chicken anemia virus?
  32. 3 things in Chicken infectious anemia seen in clin path?
    • Pancytopenia
    • Increased clotting time
    • INcreased immature RBC
  33. How do we control chicken infectious anemia
    Humoral immunity, maternal antibodies from vaccination
  34. Do we often have to vaccinate birds multiple times for CIA?
    Nope its got long lasting immunity