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Epidemiology - MIDTERM 2 > PQS - Birnavirus > Flashcards

PQS - Birnavirus Flashcards

1
Q

Bursitis virus targets the premature B lymphocytes

A

T

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2
Q

The bursitis virus causes per os infection

A

T

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3
Q

Meat type hybrids are more sensitive to Gumboro disease than layers

A

F

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4
Q

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

A

F

In 3-6 week old chickens

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5
Q

Some Gumboro disease vaccines can be applied only besides yolk immunity

A

T

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6
Q

Watery diarrhoea is typical clinical sign of Gumboro disease

A

T

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7
Q

There are several virulence variants of bursitis virus

A

T

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8
Q

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

A

T

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9
Q

Bursitis virus is highly contagious

A

T

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10
Q

Immunocomplex vaccines can be applied to prevent Gumboro disease

A

T

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11
Q

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

A

F

In chickens 3-6 weeks of age

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12
Q

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

A

T

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13
Q

Anaemia and cyanosis can be clinical signs of Gumboro disease

A

T

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14
Q

Bursitis virus causes the highest mortality in day old chicks

A

F

5-100% in 2-8 weeks of age

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15
Q

Vaccines are available to control Gumboro disease

A

T

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16
Q

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

A

T

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17
Q

The bursitis virus is very sensitive to the environmental conditions

A

F

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18
Q

Bursitis virus causes disease only in chicken

A

F

Also turkey, pheasant and ostrich

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19
Q

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

A

T

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20
Q

Both serotypes of bursitis virus are pathogenic

A

F

Only serotype 1

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21
Q

Bursitis virus infection can reduce the efficacy of vaccinations

A

T

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22
Q

Bursitis virus infection results in immunosuppression

A

T

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23
Q

Bursitis virus is shed in the faeces

A

T

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24
Q

Infectious bursitis can predispose chicken to Fowl Paratyphoid

A

T
??

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25
Q

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

A

F

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26
Q

Infectious bursitis is a very contagious disease

A

T

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27
Q

Pigeons are the most susceptible to IBDV

A

F

Chickens

28
Q

Early IBDV infection damages the humoral immunity

A

T

29
Q

Both serotypes of bursitis virus are pathogenic

A

F

30
Q

The bursitis virus mostly causes germinative infection

A

F

31
Q

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

A

F

32
Q

IBDV is a zoonotic virus

A

F

33
Q

The infectious bursal disease virus is transmitted only vertically

A

F

34
Q

Anaemia and depression are frequent signs of infectious bursal disease

A

T

35
Q

Only inactivated vaccines can be used against infectious bursal disease

A

F

36
Q

The infectious bursal disease virus is very sensitive to detergents

A

F

Non-enveloped

37
Q

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

A

F

38
Q

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

A

T

39
Q

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

A

T

40
Q

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

A

T

41
Q

Young chicken can be immunized only with inactivated IBDV vaccines.

A

F

Inactivated vaccine = mostly for booster vaccination

42
Q

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

A

T

43
Q

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

A

T

44
Q

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

A

T

45
Q

Vaccines provide high level of protection against all IBDV strains

A

F

46
Q

IBDV serotype 2 is used for immunization of chicken against Infectious Bursal Disease.

A

F

47
Q

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

A

T

48
Q

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

A

F

Only with high maternal antibodies, can cause the disease if there are non present

49
Q

The infectious bursitis virus has more than one virulence variants.

A

T

50
Q

The infectious bursitis virus causes anaemia

A

T

51
Q

The infectious bursitis virus can be isolated on CAM.

A

T

52
Q

There is no vaccine available against infectious bursitis virus

A

F

53
Q

The resistance of infectious bursitis virus is very high.

A

T

54
Q

The infectious bursitis virus spreads by mosquitoes.

A

F

55
Q

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

A

T

56
Q

By disinfection of the eggshell we can prevent IBDV infection.

A

T

57
Q

Infectious bursal disease causes severe illness, mainly in waterfowl.

A

F

‘Mainly in chickens

58
Q

The most frequent sign of infectious bursal disease is lameness.

A

F

59
Q

Only attenuated live vaccines are effective against infectious bursal disease.

A

F

60
Q

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

A

T

61
Q

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

A

T

62
Q

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

A

F

63
Q

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

A

F

64
Q

A frequent sign of the infectious bursitis is encephalitis.

A

F

65
Q

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

A

F

Can cause permanent immunosuppression in 0-3 weeks old chickens

Epidemiology - MIDTERM 2 (35 decks)

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