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Birnaviruses Flashcards

1
Q

1) Bursitis virus targets the premature B lymphocytes

A

true

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2
Q

2) The bursitis virus causes per os infection

A

true

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3
Q

3) Meat type hybrids are more sensitive to Gumboro disease than layers

A

false

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4
Q

4) Clinical signs of Gumboro disease can be seen in chickens older than 8 weeks

A

false

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5
Q

5) Some Gumboro disease vaccines can be applied only besides yolk immunity

A

true

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6
Q

6) Watery diarrhoea is typical clinical sign of Gumboro disease

A

true

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7
Q

7) There are several virulence variants of bursitis virus

A

true

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8
Q

8) Clinical signs of Gumboro disease can be seen in chickens younger than 8 weeks

A

false, should be true, cs seen in chicken 3-6 weeks of age

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9
Q

9) Bursitis virus is highly contagious

A

true

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10
Q

10) Immunocomplex vaccines can be applied to prevent Gumboro disease

A

true

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11
Q

11) Clinical signs of Gumboro disease can be seen in chickens younger than 8 days

A

false

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12
Q

12) Before vaccination against Gumboro disease the level of maternal immunity in the flock should be determined

A

true

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13
Q

13) Anaemia and cyanosis can be clinical signs of Gumboro disease

A

true

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14
Q

14) Bursitis virus causes the highest mortality in day old chicks

A

false

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15
Q

15) Vaccines are available to control Gumboro disease

A

true

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16
Q

16) In the prevention of Gumboro disease in ovo vaccinations can be applied

A

true

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17
Q

17) The bursitis virus is very sensitive to the environmental conditions

A

false

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18
Q

18) Bursitis virus causes disease only in chicken

A

false

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19
Q

19) The bursitis virus can retain its infectivity for 1-4 months in the litter

A

true

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20
Q

20) Both serotypes of bursitis virus are pathogenic

A

false

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21
Q

21) Bursitis virus infection can reduce the efficacy of vaccinations

A

true

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22
Q

22) Bursitis virus infection results in immunosuppression

A

true

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23
Q

23) Bursitis virus is shed in the faeces

A

true

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24
Q

24) Infectious bursitis can predispose chicken to Fowl Paratyphoid

A

true

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25
Q

25) In Europe only low virulence strains of infectious bursitis virus can be found

A

false

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26
Q

26) Infectious bursitis is a very contagious disease

27
Q

27) Pigeons are the most susceptible to IBDV

28
Q

28) Early IBDV infection damages the humoral immunity

29
Q

29) The bursitis virus mostly causes germinative infection

30
Q

30) IBDV type 2 is used for immunization of chicken against infectious bursal disease

31
Q

31) Ibdv is a zoonotic virus

32
Q

32) The infectious bursal disease virus is transmitted only vertically

33
Q

33) Anaemia and depression are frequent signs of infectious bursal disease

34
Q

34) Only inactivated vaccines can be used against infectious bursal disease

35
Q

35) The infectious bursal disease virus is very sensitive to detergents

36
Q

36) In Europe only low virulence strains of Infectious Bursal Disease Virus (IBDV) can be found

37
Q

37) The Infectious bursal disease virus (IBDV) is very resistant in the environment

38
Q

38) Infection of day-old chicken with IBDV may cause permanent immunosuppression

39
Q

39) Pathology lesions of the Infectious Bursal Disease can be similar to the Avian influenza.

40
Q

40) Young chicken can be immunized only with inactivated IBDV vaccines

41
Q

41) Very virulent strains of the Infectious Bursal Disease virus (IBDV) may cause disease in chicken with maternally derived antibodies too

42
Q

42) IBDV does not cause disease in adult chicken (over 2 months of age)

43
Q

43) Fever, diarrhea and anemia are signs of the Infectious Bursal Disease

44
Q

44) Vaccines provide high level of protection against all IBDV strains

45
Q

45) Clinical manifestations of infectious bursal disease are seen mainly in chicken between the age of 3 and 6 weeks

46
Q

46) Moderately attenuated (“hot”) IBDV vaccines are used for the immunization of young chicken without yolk immunity

47
Q

47) The infectious bursitis virus has more than one virulence variants

48
Q

48) The infectious bursitis virus causes anaemia

49
Q

49) The infectious bursitis virus can be isolated on CAM

50
Q

50) There is no vaccine available against infectious bursitis virus

51
Q

51) The resistance of infectious bursitis virus is very high

52
Q

52) The infectious bursitis virus spreads by mosquitoes

53
Q

53) IBDV causes immunosuppression in chicken between 2-8 weeks of age

54
Q

54) By disinfection of the eggshell we can prevent IBDV infection

55
Q

55) Infectious bursal disease causes severe illness, mainly in waterfowl

56
Q

56) The most frequent sign of infectious bursal disease is lameness

57
Q

57) Only attenuated live vaccines are effective against infectious bursal disease

58
Q

58) Several antigenic and virulence variants of infectious bursal disease virus are known

59
Q

59) The infectious bursitis is usually seen in 3 to 8 weeks-old flocks

60
Q

60) The most frequent sign of infectious bursal disease is lameness due to the inflammation of the subtendinal bursae

61
Q

61) The infectious bursitis virus is inactivated within 1-2 days in the environment

62
Q

62) A frequent sign of the infectious bursitis is encephalitis

63
Q

63) The infectious bursitis virus does not cause any damage in chickens under the age of two weeks

Epi (74 decks)

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