Birnaviruses

Question 1

1) Bursitis virus targets the premature B lymphocytes

Answer 1

true

Question 2

2) The bursitis virus causes per os infection

Answer 2

true

Question 3

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

Answer 3

false

Question 4

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

Answer 4

false

Question 5

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

Answer 5

true

Question 6

6) Watery diarrhoea is typical clinical sign of Gumboro disease

Answer 6

true

Question 7

7) There are several virulence variants of bursitis virus

Answer 7

true

Question 8

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

Answer 8

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

Question 9

9) Bursitis virus is highly contagious

Answer 9

true

Question 10

10) Immunocomplex vaccines can be applied to prevent Gumboro disease

Answer 10

true

Question 11

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

Answer 11

false

Question 12

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

Answer 12

true

Question 13

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

Answer 13

true

Question 14

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

Answer 14

false

Question 15

15) Vaccines are available to control Gumboro disease

Answer 15

true

Question 16

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

Answer 16

true

Question 17

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

Answer 17

false

Question 18

18) Bursitis virus causes disease only in chicken

Answer 18

false

Question 19

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

Answer 19

true

Question 20

20) Both serotypes of bursitis virus are pathogenic

Answer 20

false

Question 21

21) Bursitis virus infection can reduce the efficacy of vaccinations

Answer 21

true

Question 22

22) Bursitis virus infection results in immunosuppression

Answer 22

true

Question 23

23) Bursitis virus is shed in the faeces

Answer 23

true

Question 24

24) Infectious bursitis can predispose chicken to Fowl Paratyphoid

Answer 24

true

Question 25

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

Answer 25

false

Question 26

26) Infectious bursitis is a very contagious disease

Answer 26

true

Question 27

27) Pigeons are the most susceptible to IBDV

Answer 27

false

Question 28

28) Early IBDV infection damages the humoral immunity

Answer 28

true

Question 29

29) The bursitis virus mostly causes germinative infection

Answer 29

false

Question 30

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

Answer 30

false

Question 31

31) Ibdv is a zoonotic virus

Answer 31

false

Question 32

32) The infectious bursal disease virus is transmitted only vertically

Answer 32

false

Question 33

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

Answer 33

true

Question 34

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

Answer 34

false

Question 35

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

Answer 35

false

Question 36

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

Answer 36

false

Question 37

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

Answer 37

true

Question 38

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

Answer 38

true

Question 39

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

Answer 39

true

Question 40

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

Answer 40

false

Question 41

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

Answer 41

true

Question 42

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

Answer 42

true

Question 43

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

Answer 43

true

Question 44

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

Answer 44

false

Question 45

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

Answer 45

true

Question 46

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

Answer 46

false

Question 47

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

Answer 47

true

Question 48

48) The infectious bursitis virus causes anaemia

Answer 48

true

Question 49

49) The infectious bursitis virus can be isolated on CAM

Answer 49

true

Question 50

50) There is no vaccine available against infectious bursitis virus

Answer 50

false

Question 51

51) The resistance of infectious bursitis virus is very high

Answer 51

true

Question 52

52) The infectious bursitis virus spreads by mosquitoes

Answer 52

false

Question 53

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

Answer 53

true

Question 54

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

Answer 54

true

Question 55

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

Answer 55

false

Question 56

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

Answer 56

false

Question 57

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

Answer 57

false

Question 58

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

Answer 58

true

Question 59

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

Answer 59

true

Question 60

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

Answer 60

false

Question 61

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

Answer 61

false

Question 62

62) A frequent sign of the infectious bursitis is encephalitis

Answer 62

false

Question 63

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

Answer 63

false