Birnaviruses Flashcards
1) Bursitis virus targets the premature B lymphocytes
true
2) The bursitis virus causes per os infection
true
3) Meat type hybrids are more sensitive to Gumboro disease than layers
false
4) Clinical signs of Gumboro disease can be seen in chickens older than 8 weeks
false
5) Some Gumboro disease vaccines can be applied only besides yolk immunity
true
6) Watery diarrhoea is typical clinical sign of Gumboro disease
true
7) There are several virulence variants of bursitis virus
true
8) Clinical signs of Gumboro disease can be seen in chickens younger than 8 weeks
false, should be true, cs seen in chicken 3-6 weeks of age
9) Bursitis virus is highly contagious
true
10) Immunocomplex vaccines can be applied to prevent Gumboro disease
true
11) Clinical signs of Gumboro disease can be seen in chickens younger than 8 days
false
12) Before vaccination against Gumboro disease the level of maternal immunity in the flock should be determined
true
13) Anaemia and cyanosis can be clinical signs of Gumboro disease
true
14) Bursitis virus causes the highest mortality in day old chicks
false
15) Vaccines are available to control Gumboro disease
true
16) In the prevention of Gumboro disease in ovo vaccinations can be applied
true
17) The bursitis virus is very sensitive to the environmental conditions
false
18) Bursitis virus causes disease only in chicken
false
19) The bursitis virus can retain its infectivity for 1-4 months in the litter
true
20) Both serotypes of bursitis virus are pathogenic
false
21) Bursitis virus infection can reduce the efficacy of vaccinations
true
22) Bursitis virus infection results in immunosuppression
true
23) Bursitis virus is shed in the faeces
true
24) Infectious bursitis can predispose chicken to Fowl Paratyphoid
true
25) In Europe only low virulence strains of infectious bursitis virus can be found
false