PQS - Birnavirus Flashcards
Bursitis virus targets the premature B lymphocytes
T
The bursitis virus causes per os infection
T
Meat type hybrids are more sensitive to Gumboro disease than layers
F
Clinical signs of Gumboro disease can be seen in chickens older than 8 weeks
F
In 3-6 week old chickens
Some Gumboro disease vaccines can be applied only besides yolk immunity
T
Watery diarrhoea is typical clinical sign of Gumboro disease
T
There are several virulence variants of bursitis virus
T
Clinical signs of Gumboro disease can be seen in chickens younger than 8 weeks
T
Bursitis virus is highly contagious
T
Immunocomplex vaccines can be applied to prevent Gumboro disease
T
Clinical signs of Gumboro disease can be seen in chickens younger than 8 days
F
In chickens 3-6 weeks of age
Before vaccination against Gumboro disease the level of maternal immunity in the flock
should be determined
T
Anaemia and cyanosis can be clinical signs of Gumboro disease
T
Bursitis virus causes the highest mortality in day old chicks
F
5-100% in 2-8 weeks of age
Vaccines are available to control Gumboro disease
T
In the prevention of Gumboro disease in ovo vaccinations can be applied
T
The bursitis virus is very sensitive to the environmental conditions
F
Bursitis virus causes disease only in chicken
F
Also turkey, pheasant and ostrich
The bursitis virus can retain its infectivity for 1-4 months in the litter
T
Both serotypes of bursitis virus are pathogenic
F
Only serotype 1
Bursitis virus infection can reduce the efficacy of vaccinations
T
Bursitis virus infection results in immunosuppression
T
Bursitis virus is shed in the faeces
T
Infectious bursitis can predispose chicken to Fowl Paratyphoid
T
??
In Europe only low virulence strains of infectious bursitis virus can be found
F
Infectious bursitis is a very contagious disease
T
Pigeons are the most susceptible to IBDV
F
Chickens
Early IBDV infection damages the humoral immunity
T
Both serotypes of bursitis virus are pathogenic
F
The bursitis virus mostly causes germinative infection
F
IBDV type 2 is used for immunization of chicken against infectious bursal disease
F
IBDV is a zoonotic virus
F
The infectious bursal disease virus is transmitted only vertically
F
Anaemia and depression are frequent signs of infectious bursal disease
T
Only inactivated vaccines can be used against infectious bursal disease
F
The infectious bursal disease virus is very sensitive to detergents
F
Non-enveloped
In Europe only low virulence strains of Infectious Bursal Disease Virus (IBDV) can be found.
F
The Infectious bursal disease virus (IBDV) is very resistant in the environment.
T
Infection of day-old chicken with IBDV may cause permanent immunosuppression.
T
Pathology lesions of the Infectious Bursal Disease can be similar to the Avian influenza.
T
Young chicken can be immunized only with inactivated IBDV vaccines.
F
Inactivated vaccine = mostly for booster vaccination
Very virulent strains of the Infectious Bursal Disease virus (IBDV) may cause disease in chicken with maternally derived antibodies too.
T
IBDV does not cause disease in adult chicken (over 2 months of age).
T
Fever, diarrhea and anemia are signs of the Infectious Bursal Disease.
T
Vaccines provide high level of protection against all IBDV strains
F
IBDV serotype 2 is used for immunization of chicken against Infectious Bursal Disease.
F
Clinical manifestations of infectious bursal disease are seen mainly in chicken between the age of 3 and 6 weeks.
T
Moderately attenuated (“hot”) IBDV vaccines are used for the immunization of young chicken without yolk immunity
F
Only with high maternal antibodies, can cause the disease if there are non present
The infectious bursitis virus has more than one virulence variants.
T
The infectious bursitis virus causes anaemia
T
The infectious bursitis virus can be isolated on CAM.
T
There is no vaccine available against infectious bursitis virus
F
The resistance of infectious bursitis virus is very high.
T
The infectious bursitis virus spreads by mosquitoes.
F
IBDV causes immunosuppression in chicken between 2-8 weeks of age.
T
By disinfection of the eggshell we can prevent IBDV infection.
T
Infectious bursal disease causes severe illness, mainly in waterfowl.
F
‘Mainly in chickens
The most frequent sign of infectious bursal disease is lameness.
F
Only attenuated live vaccines are effective against infectious bursal disease.
F
Several antigenic and virulence variants of infectious bursal disease virus are known
T
The infectious bursitis is usually seen in 3 to 8 weeks-old flocks.
T
The most frequent sign of infectious bursal disease is lameness due to the inflammation of the subtendinal bursae.
F
The infectious bursitis virus is inactivated within 1-2 days in the environment
F
A frequent sign of the infectious bursitis is encephalitis.
F
The infectious bursitis virus does not cause any damage in chickens under the age of two weeks.
F
Can cause permanent immunosuppression in 0-3 weeks old chickens
