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Epidemiology - MIDTERM 1 > Topic 9 - Avian diseases caused by circoviruses, chicken infectious anaemia. > Flashcards

Topic 9 - Avian diseases caused by circoviruses, chicken infectious anaemia. Flashcards

1
Q

Name diseases in Avian caused by circovirus:

A
  1. Goose circovirus (GoCV)
  2. Pigeon circovirus (PiCV)
  3. Psittacine Beak and feather disease (BFDV)
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2
Q

What does the avian circovirus disease have in common with the PCV?

A
  1. High morbidity, low mortality
  2. Growing resistance with age
  3. Immune suppression, secondary infections
  4. Lymphocyte depletion
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3
Q

which age of birds is affected by BFDV?

A

Young birds, below 3 years

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4
Q

What type of transmission of BFDV?

A

Horizontal and vertical

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5
Q

How is the replication of BFDV?

A

Rapid dividing cells, areas on beak and claws

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6
Q

Symptoms of ACUTE form of BFDV?

A
  1. Lethargy
  2. anorexia
  3. respiratory signs
  4. weight loss
  5. vomiting
  6. diarrhoea

Death within 2-4 weeks because of secondary infections

Frequently before the typical feather and beak
deformities

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7
Q

Symptoms of CHRONIC form of BFDV?

A
  1. typical lesions sometimes obvious only
    after molting
  2. loss of feather
  3. feather and beak deformities
  4. Can go on for years or die within 1 year because of secondary infections
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8
Q

Which disease?

A

BFDV

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9
Q

Are the birds who survived still carriers of the disease?

A

yes

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10
Q

Age of bird affected by pigeon circovirus?

A

Mostly between 1-12 months

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11
Q

Clinical signs of PiCV:

A
  1. Lethargy
  2. anorexia
  3. beak
  4. feather and claw deformities
  5. The race performance is decreased
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12
Q

What type of transmission in PiCV?

A

Mostly horisontal, but also vertical

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13
Q

Acute form of PiCV:

A
  1. Lethargy
  2. anorexia
  3. respiratory signs
  4. weight loss
  5. vomiting
  6. diarrhoea

Death within 2-5 days

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14
Q

age of birds affected with Goose Circovirus:

A

from 1 week old

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15
Q

mortality rate of Goose Circovirus

A

HIGH

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16
Q

signs of Goose Circovirus:

A
  1. Retarded growth
  2. Decreased production
  3. Feather deformation
17
Q

causative agent of chicken infectious anaemia:

A

Anelloviridae/ Gyrovirus genus

18
Q

Which disease?

19
Q

Chicken Infectious Anaemia causes?

A

Anaemia + Immune suppression

20
Q

Which specie is infected by Chicken Infectious Anaemia?

A

Only chickens

21
Q

Type of spread of Chicken Infectious Anaemia:

A
  • Vertical (egg, sperm)
  • Horizontal (direct contact, feces, fomites)
22
Q

Infection of Chicken Infectious Anaemia in chickens under 3 weeks:

A

Causes disease and severe symptoms

23
Q

Infection of Chicken Infectious Anaemia in chickens over 3 weeks:

A

No disease or mild symptoms

Up to 1 month - Death within days

24
Q

What is the route of infection of Chicken Infectious Anaemia?

25
Where does the replication of Chicken Infectious Anaemia take place?
The intestines
26
Which organs is affected by viraemia in Chicken Infectious Anaemia?
Bone marrow and other organs
27
How is the Chicken Infectious Anaemia virus shed?
Trough eggs and faeces. Can be shed at up to 2 months, with its maximum at 2 weeks
28
Two types of Chicken Infectious Anaemia, which is most common:
Subclinical and clinical Most common: Subclinical
29
Which age of Chicken Infectious Anaemia shows clinical signs?
Usually up to 1 month of age, after that gradual decline
30
Incubation time of Chicken Infectious Anaemia:
7-10 days, death within days
31
Pathological and histopathological signs of Chicken Infectious Anaemia:
1. Anaemia 2. Oedema 3. Haemorrhages, also in gizzard and proventriculus 4. Atrophy in the thymus and bursa 5. the bone marrow is yellow 6. liver necrosis 7. Myeloid and lymphoid cells destroy
32
Diagnosis method of Chicken Infectious Anaemia:
1. Virus isolation 2. IF 3. PCR 4. ELISA
33
Differential diagnosis of Chicken Infectious Anaemia:
1. Avian influenza 2. Newcastle disease 3. Infectious bursitis
34
Vaccination type in case of Chicken Infectious Anaemia:
Live vaccine, Inactivated virulent
35
Age of vaccination
Laying hens: 12-15 weeks,
36
Route of infection and age:
By drinking: 12-16 weeks IM, SC: min, 2 week old and 6 weeks before laying
37

Epidemiology - MIDTERM 1 (22 decks)

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