BVD Border Disease of Sheep Flashcards
BVDV can be frequently detected in the background of respiratory diseases
T
yes because it replicates in lymphatic tissue causing immunosuppression and coinfections
BVD virus is particularly resistant to disinfectants
F
Rodents play a central role in the maintenance of BVD virus in the environment
F
Cytopathic and non-cytopathic biotypes of the Bovine Viral Diarrhoea (BVD) virus are known
T
In utero infection with non-cytopathic BVDV can cause seropositivity of the newborn calf
T
Non cytopathic strains of Bovine viral diarrhoea virus (BVDV) can cause hydrocephalus and cerebellar hypoplasia
F
In utero infection with non cytopathic BVDV can cause immunotolerance
T
40-120 days = persistently infected immunotolerant calve
In utero infection with cytopathic BVDV strain results immunotolerant calves
F
Swine are not susceptible to BVD
F
Two serotypes of the BVD virus are known so far, serotype 2 is more virulent
T
Pigs infected with BVDV turn seropositive to classical swine fever
T
Persistently infected cattle can maintain BVDV in a farm
T
Cytopathic strains of Bovine Viral diarrhoea (BVDV) alone can cause mucosal disease
F
Non-cytopathic BVD virus strain can mutate and become cytopathic
T
The BVD virus can infect pigs also
T
Cytopathic strains of the Bovine Viral Diarrhoea virus (BVDV) can cause abortion
T
Non cytopathic strains of Bovine Viral Diarrhoea virus (BVDV) do not cause transplacental infection
F
Intrauterine BVD virus infection always causes abortion
F
Cattle which are immune tolerant to BVD virus may develop mucosal disease
T
immunotolerant -= ncp infected at gestation 40-120 days then superinfected with cp or mutates to cp
In sheep BVDV causes symptoms similar to border disease
T
Mucosal disease can develop in cattle persistently infected with BVDV
T
Non cytopathic strains of Bovine viral diarrhoea virus (BVDV) can cause immunosuppression
T
yes mild
BVDV can be transmitted by semen
T
BVD virus cannot be transmitted via artificial insemination
F
In mucosal disease sharp edged, usually round or oval ulcers can be observed on the oral mucosa
T
In mucosal disease haemorrhages can be observed under the serosal surfaces and in the kidney cortex
T
Bloody diarrhoea is a clinical sign of the mucosal disease
T
BVD virus cannot be propagated in cell cultures
F
Mucosal disease usually emerges in cattle farms as explosive outbreaks with high morbidity
F
is rare not explosive outbreaks
BVD and mucosal disease are caused by the same viral species
T
Attenuated vaccine strains against the bovine viral diarrhoea virus may have foetopathic effects
T
Eradication programmes against the bovine viral diarrhoea virus are usually based on the selection of immunotolerant animals
T
Eradication of BVD virus is based on the removal of immunotolerant animals
T
The only efficient way of BVD eradication is the replacement of all animals on the farm
F
Two genotypes of the BVDV are known
T
BVDV forms one serotype, but there are significant antigenic differences between the strains
T
Persistently infected animals play the major role in the maintenance and spread of BVDV
T
BVDV infection may cause immunosuppression
T
Bovine neonatal pancytopenia (BNP) is an immunopathy observed in immunotolerant, BVDV infected calves
F
Bovine neonatal pancytopenia (BNP) is caused by a bovine viral diarrhea
F
The BVD virus typically damages endothelial-, epithelial- and lymphatic tissues
T
Wild birds are the natural hosts of the BVDV
F
Environmental contamination does not play a role in the spread of the BVDV
F
Only inactivated vaccines can be used for the prevention against BVD
F
are safer yes but also live can be used
The BVD virus genotype 2 is less virulent than genotype 1
F
BVD clinically is mostly seen in cattle from 6 to 24 months of age.
T
BVD virus can cause severe damage to fetuses in pregnant cows
T
Only cattle is susceptible to BVD virus
F
BVD virus exists in several serotypes
F
BVD infection of pregnant cows can result in delivery of immunotolerant persistently infected calves
T
Bulls can shed BVD virus for long time in semen, without showing any clinical sign
T
Both attenuated live and inactivated vaccines are used in eradication of BVD
T
BVDV is practically sensitive to disinfectants
T
Rodents play a central role in the maintenance of BVD virus in the environment
F
Bovine Viral Diarrhoea cannot be transmitted with AI
F
Mucosal Disease, only inactivated vaccines can be used for the prevention against BVD
F
Cytopathic BVDV strains cause mucosal disease in immune-tolerant calves
!!T!!
is like saying ncp calve suprainfected with cp = mucosal disease
Because Europe is free from BVD, it is forbidden to use vaccines against it
F
Because IBDV is an immunosuppressive virus, no vaccines available against it
F
The Border disease virus causes pneumonia in sheep
F
The border disease is present only in the United Kingdom
F
The border disease virus frequently causes encephalitis in ewes
F
Goats can be infected with border disease
T
Border disease in most frequently seen in horses
F
In utero border disease virus infection may cause immunotolerance
T
The Border disease is a haemorrhagic, respiratory syndrome in sheep
F
not resp
Border disease of sheep is mainly characterized by foetal damages
T
Border disease appears as foetal damage in pregnant ewes
T
Border disease is a respiratory and enteric disease of lambs
F
Border disease occurs in Hungary
T
90% of herds seropositive
Border disease causes abortion in ewes
T
Border disease of sheep can be controlled by screening for carriers
T
