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Epidemiology - MIDTERM 2 > PQS - Flavivirus (2) > Flashcards

PQS - Flavivirus (2) Flashcards

1
Q

BVDV can be frequently detected in the background of respiratory diseases

A

T

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2
Q

BVD virus is particularly resistant to disinfectants

A

F

They are sensitive to disinfectants and detergents

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3
Q

Rodents play a central role in the maintenance of BVD virus in the environment

A

F

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4
Q

Cytopathic and non-cytopathic biotypes of the Bovine Viral Diarrhoea (BVD) virus are known

A

T

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5
Q

In utero infection with non-cytopathic BVDV can cause seropositivity of the newborn calf

A

T

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6
Q

Non cytopathic strains of Bovine viral diarrhoea virus (BVDV) can cause hydrocephalus and cerebellar hypoplasia

A

F

Cytopathic strain can cause these

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7
Q

In utero infection with non cytopathic BVDV can cause immunotolerance

A

T

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8
Q

In utero infection with cytopathic BVDV strain results immunotolerant calves

A

F

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9
Q

Swine are not susceptible to BVD

A

F

Cattle, zebu, buffalo, wild ruminants, sheep, goat and swine

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10
Q

Two serotypes of the BVD virus are known so far, serotype 2 is more virulent

A

F

There are two different GENOTYPES, and genotype 2 is more virulent

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11
Q

Pigs infected with BVDV turn seropositive to classical swine fever

A

F

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12
Q

Persistently infected cattle can maintain BVDV in a farm

A

T

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13
Q

Cytopathic strains of Bovine Viral diarrhoea (BVDV) alone can cause mucosal disease

A

F

Both strains have to be present!!

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14
Q

Non-cytopathic BVD virus strain can mutate and become cytopathic

A

T

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15
Q

The BVD virus can infect pigs also

A

T

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16
Q

Non cytopathic strains of Bovine Viral Diarrhoea virus (BVDV) do not cause transplacental infection

A

F

Will lead to immunotolerance

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17
Q

Cytopathic strains of the Bovine Viral Diarrhoea virus (BVDV) can cause abortion

A

T

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18
Q

Intrauterine BVD virus infection always causes abortion

A

F

Depending on the cytopathic strain

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19
Q

Cattle which are immune tolerant to BVD virus may develop mucosal disease

A

T

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20
Q

In sheep BVDV causes symptoms similar to border disease

A

T

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21
Q

Mucosal disease can develop in cattle persistently infected with BVDV

A

T

But both strains have to be present!!

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22
Q

Non cytopathic strains of Bovine viral diarrhoea virus (BVDV) can cause immunosuppression

A

T

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23
Q

BVDV can be transmitted by semen

A

T

Semen may carry the virus even if it is not detected in the white blood cells

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24
Q

BVD virus cannot be transmitted via artificial insemination

A

F

Can be transmitted: per os, with mating and artificial insemination

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25
Q

In mucosal disease sharp edged, usually round or oval ulcers can be observed on the oral mucosa

A

T

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26
Q

In mucosal disease haemorrhages can be observed under the serosal surfaces and in the kidney cortex

A

T

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27
Q

Bloody diarrhoea is a clinical sign of the mucosal disease

A

T

Haemorrhagic diarrhoea

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28
Q

BVD virus cannot be propagated in cell cultures

A

F

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29
Q

Mucosal disease usually emerges in cattle farms as explosive outbreaks with high morbidity

A

F

Sporadic outbreak with high morbidity

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30
Q

BVD and mucosal disease are caused by the same viral species

A

T

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31
Q

Eradication programmes against the bovine viral diarrhoea virus are usually based on the
selection of immunotolerant animals

A

T

31
Q

Attenuated vaccine strains against the bovine viral diarrhoea virus may have foetopathic effects

A

T

32
Q

Eradication of BVD virus is based on the removal of immunotolerant animals

A

T

33
Q

The only efficient way of BVD eradication is the replacement of all animals on the farm

A

F

34
Q

Two genotypes of the BVDV are known

A

T

35
Q

BVDV forms one serotype, but there are significant antigenic differences between the strains

A

F

They have similar antigenic properties, which is why we see cross-reactions

36
Q

Persistently infected animals play the major role in the maintenance and spread of BVDV

A

T

37
Q

BVDV infection may cause immunosuppression

A

T

38
Q

Bovine neonatal pancytopenia (BNP) is an immunopathy observed in immunotolerant, BVDV infected calves

A

F

39
Q

Bovine neonatal pancytopenia (BNP) is caused by a bovine viral diarrhea

A

F

40
Q

The BVD virus typically damages endothelial-, epithelial- and lymphatic tissues

A

T

41
Q

Wild birds are the natural hosts of the BVDV

A

F

42
Q

Environmental contamination does not play a role in the spread of the BVDV

A

F

43
Q

Only inactivated vaccines can be used for the prevention against BVD

A

F

Attenuated and inactivated vaccines

43
Q

The BVD virus genotype 2 is less virulent than genotype 1.

A

F

Genotype 2 is more virulent than genotype 1

44
Q

The BVD virus cannot be transmitted via artificial insemination.

A

F

45
Q

BVD clinically is mostly seen in cattle from 6 to 24 months of age.

A

T

Seen in 4-24 month old calves/heifers

46
Q

BVD virus can cause severe damage to fetuses in pregnant cows.

A

T

47
Q

Only cattle is susceptible to BVD virus.

A

F

48
Q

BVD virus exists in several serotypes

A

F

Several genotypes only

49
Q

BVD infection of pregnant cows can result in delivery of immunotolerant persistently
infected calves.

A

T

50
Q

Bulls can shed BVD virus for long time in semen, without showing any clinical sign.

A

T

51
Q

Both attenuated live and inactivated vaccines are used in eradication of BVD.

A

T

52
Q

BVDV cannot be propagated in cell cultures.

A

F

53
Q

BVDV is practically sensitive to disinfectants.

A

T

54
Q

Rodents play a central role in the maintenance of BVD virus in the environment.

A

F

55
Q

Bovine Viral Diarrhoea cannot be transmitted with AI.

A

F

56
Q

The BVD virus typically damages endothelial epithelial- and lymphatic tissues.

A

T

57
Q

Mucosal Disease, only inactivated vaccines can be used for the prevention against BVD.

A

F

57
Q

Cytopathic BVDV strains cause mucosal disease in immune-tolerant calves.

A

T

58
Q

Because Europe is free from BVD, it is forbidden to use vaccines against it.

A

F

BVDV is worldwide

59
Q

Because IBDV is an immunosuppressive virus, no vaccines available against it

A

F

60
Q

The Border disease virus causes pneumonia in sheep

A

F

Weak lambs, ataxia, trembling and pigmented wool

61
Q

The border disease is present only in the United Kingdom

A

F

Worldwide

62
Q

The border disease virus frequently causes encephalitis in ewes

A

F

63
Q

Goats can be infected with border disease

A

T

64
Q

Border disease in most frequently seen in horses

A

F

65
Q

In utero border disease virus infection may cause immunotolerance

A

T

66
Q

The Border disease is a haemorrhagic, respiratory syndrome in sheep

A

F

67
Q

Border disease of sheep is mainly characterized by foetal damages

A

T

68
Q

Border disease appears as foetal damage in pregnant ewes.

A

T

69
Q

Border disease is a respiratory and enteric disease of lambs.

A

F

70
Q

Border disease occurs in Hungary.

A

T

71
Q

Border disease causes abortion in ewes.

A

T

Cause abortion in the first half of pregnancy

72
Q

Border disease of sheep can be controlled by screening for carriers.

A

T

Epidemiology - MIDTERM 2 (35 decks)

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