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Epidemiology > Midterm 1: Circovirus + Anellovirus > Flashcards

Midterm 1: Circovirus + Anellovirus Flashcards

1
Q

The reproduction of the circovirus continuous in the dividing cells

A

True

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2
Q

The circovirus is too small so it’s a bad antigen

A

False

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3
Q

The circovirus is a good antigen

A

True

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4
Q

Circovirus infections are immune suppressive

A

True

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5
Q

Circovirus can easily be cultured in different homologous cell lines

A

False

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6
Q

Circoviruses can be cultured easily in many cell lines

A

False

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7
Q

Resistance of circovirus is very low, in the environment they are inactivated within a day

A

False

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8
Q

The resistance of Circoviruses is high, they remain infectious in the environment for several months

A

True

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9
Q

Causes generalised lymphoid depletion

A

True

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10
Q

Only causes the depletion of B-lymphocytes

A

False

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11
Q

Canine circoviruses are present worldwide

A

False

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12
Q

Circovirus are very resistant viruses

A

True

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13
Q

The circovirus has circular RNA in its genome

A

False

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14
Q

Swine circovirus causes lesions in multiple organs and strong immunosuppression

A

True

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15
Q

Porcine circovirus can be transmitted by mice and rats

A

True

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16
Q

Porcine circovirus vaccines are available both for sows and for piglets

A

True

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17
Q

Detection of PCV2’s DNA is enough for the correct diagnosis

A

False

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18
Q

Four species of swine circovirus were described

A

True

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19
Q

The porcine circovirus 2 is proven to be immunosuppressive

A

True

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20
Q

PCV2 detection in foetal myocardium is pathognomic value

A

True

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21
Q

Porcine circovirus replicates in the myocardium of the foetus

A

True

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22
Q

In pigs the porcine circovirus 2 can cause BFD

A

False

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23
Q

The porcine circovirus can replicate in the foetus

A

True

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24
Q

The clinical signs, pathological and histopathological examination suggest PCV2 induced disease T

A

True

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25
Q

PCV2 can cause respiratory signs

A

True

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26
Q

The primer replication of PCV2 is in lymphoid tissues of the throat

A

True

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27
Q

PCV2 infection does not always cause clinical signs

A

True

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28
Q

Porcine circovirus 2 always causes clinical signs in pigs

A

False

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29
Q

Porcine circovirus 2 always causes clinical signs in cattle

A

False

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30
Q

There is no efficient vaccine against PCV2

A

False

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31
Q

The porcine circovirus can replicate in the foetus

A

True

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32
Q

Circovirus in pigs can be subclinical

A

True

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33
Q

Porcine circoviruses are responsible for a variety of clinical conditions

A

True

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34
Q

Porcine circoviruses cannot be responsible for reproductive disorders

A

False

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35
Q

Porcine circoviruses are present worldwide

A

True

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36
Q

Porcine circoviruses cause severe hemorrhagic diseases in pigs

A

True

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37
Q

Porcine circoviruses are genetically and antigenically uniform

A

False

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38
Q

Porcine circoviruses may cause a variety of diseases

A

True

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39
Q

For prevention of Swine circovirus disease only general hygienic measures can be used

A

False

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40
Q

Swine circovirus can cause retarded growth and strong immunosuppression

A

True

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41
Q

Swine circovirus-caused disease occurs worldwide, it is frequent

A

True

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42
Q

For prevention of swine circovirus disease, inactivated vaccine is available

A

True

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43
Q

Swine circovirus causes only respiratory signs

A

False

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44
Q

Swine circovirus may be shed in excretions for several months after recovery

A

True

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45
Q

For prevention of Porcine circovirus disease vaccines are available

A

True

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46
Q

The incubation period of Porcine circovirus caused disease is about 2-4 weeks

A

True

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47
Q

Incubation period of porcine circovirus disease is short, some days

A

False

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48
Q

Porcine circovirus-2 causes clinical signs mainly after weaning

A

True

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49
Q

Predisposing factors for Porcine Circovirus associated disease can be: Vaccines. The virus variant. Virus strain

A

True

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50
Q

Predisposing factors for Porcine Circovirus associated disease can be Food management

A

False

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51
Q

PCV2 can cause: Enteric disorders. Disorders in the nervous system. Respiratory disease. Reproduction disorders

A

True

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52
Q

Porcine circovirus-1 may damage the foetus

A

True

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53
Q

Porcine circoviruses cannot be responsible for reproductive disorders

A

False

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54
Q

Porcine circoviruses replicate in the heart of the foetus

A

True

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55
Q

Circovirus can be responsible for the Porcine Respiratory Disease Complex

A

True

56
Q

Reproductive disorders caused by Porcine circoviruses are only significant in North America

A

False

57
Q

Circovirus causes skin lesions in swine

A

True

58
Q

A clinical sign of PMWS can be a progressive weight loss

A

True

59
Q

PMWS is a type 3 hypersensitivity

A

False

60
Q

PMWS is a type 4 hypersensitivity

A

False

61
Q

One of the most common pathological signs of PMWS is glomerulonephritis

A

False

62
Q

Typical pathological finding of PMWS is enlarged mesenteric lymph nodes

A

True

63
Q

Typical pathological finding of PMWS is pneumonia

A

False

64
Q

A clinical sign of PMWS can be haemorrhages in the skin

A

False

65
Q

In pigs the porcine circovirus 1 can cause PMWS

A

False

66
Q

In pigs the porcine circovirus 2 can cause PDNS

A

True

67
Q

One of the most common pathological signs of PDNS is glomerulonephritis

A

True

68
Q

PDNS is an allergic disease

A

True

69
Q

The appearance of PDNS is related to the good antigenicity of PCV2

A

True

70
Q

PDNS is a type III hypersensitivity

A

True

71
Q

PDNS is a type IV hypersensitivity

A

False

72
Q

PDNS may develop without porcine circovirus 2

A

True

73
Q

One of the most common clinical signs of PDNS is multifocal circular red skin disease

A

True

74
Q

Porcine dermatitis nephropathy can only be caused by circoviruses

A

False

75
Q

Porcine dermatitis and nephropathy syndrome are only caused by PCV-2

A

False

76
Q

PDNS disease is an immunocomplex disease

A

True

77
Q

PDNS is only caused by PCV-1

A

False

78
Q

PDNS does not occur in Hungary

A

False

79
Q

PDNS occurs primarily in the weeks following the selection/weaning

A

True

80
Q

PDNS is caused by both PCV-1 and PCV-2

A

False

81
Q

PDNS is not caused by PCV

A

False

82
Q

PDNS has been widespread in Hungary since 1998

A

True

83
Q

PDNS is a rare infection causing clinical signs only in piglets before weaning.

A

False

84
Q

PDNS is a frequent infection with clinical signs after weaning

A

True

85
Q

Prevention of PDNS is with live attenuated vaccines

A

False

86
Q

Regarding PDNS, general preventative rules and recently inactivated or vector vaccination can be used

A

True

87
Q

In pigs the porcine circovirus 2 can cause BFD

A

False

88
Q

Avian circovirus causes clinical signs similar to those seen in PMWS

A

True

89
Q

Avian circovirus causes clinical signs similar to those seen in PDNS

A

False

90
Q

The pigeon circovirus is not an important disease because the virus causes feather and beak deformities

A

False

91
Q

The beak and feather diseases causes typically neurological signs

A

False

92
Q

In parrots porcine circovirus 2 causes the psittacine beak and feather disease

A

False

93
Q

The beak and feather disease can be acute problem

A

True

94
Q

Feather and beak deformities may appear after circovirus infection of geese and pigeons

A

True

95
Q

Beak and feather disease lesions are sometimes obvious only after moulting

A

True

96
Q

Avian circovirus infections result in high morbidity and low mortality

A

True

97
Q

Pigeon circoviruses are antigenically uniform

A

False

98
Q

Pigeon circoviruses frequently appear in diseases together with other viruses and bacteria

A

True

99
Q

Circovirus in geese and ducks can cause retarded growth and feather formation disturbances

A

True

100
Q

Avian circoviruses do not cause clinical signs in domestic birds

A

False

101
Q

In ducks and geese, Avian circoviruses can cause retarded growth and immunosuppression

A

True

102
Q

Avian circoviruses can spread via breeder eggs

A

True

103
Q

Avian circoviruses do not cause disease in wild birds

A

False

104
Q

Avian circoviruses are species specific

A

True (?)

105
Q

Avian circoviruses can infect many poultry species

A

True

106
Q

Avian circoviruses can cause retarded growth and immunosuppression

A

True

107
Q

Inactivated vaccines are used against pigeon circovirus infections

A

False

108
Q

Pigeon circovirus infections do not occur in Hungary, the disease is prevented by vaccination

A

False

109
Q

Circoviruses can infect pigeons

A

True

110
Q

Vaccines are available for Pigeon Circoviruses

A

False

111
Q

Clinical signs of PBFDV (Psittacine Beak and Feather Disease Virus) are only seen at time of moulting

A

False

112
Q

The chicken infectious anaemia virus is also commonly detected in geese

A

False

113
Q

Anaemia and haemorrhages are two important clinical signs of chicken anaemia.

A

True

114
Q

The chicken infectious anaemia is a chicken disease up to 1 month of age

A

True

115
Q

The chicken infectious anaemia virus causes only anaemia

A

False

116
Q

The chicken anaemia virus does not replicate in lymphoid progenitors

A

False

117
Q

There are vaccines available against chicken anaemia

A

True

118
Q

The chicken infectious anaemia is a disease of hens

A

False

119
Q

The chicken infectious anaemia causes clinical signs similar to those seen in PDNS

A

False

120
Q

Vertical infectious is not possible in chicken infectious anaemia

A

False

121
Q

Infection of day old chickens with the chicken anaemia virus leads to immunosuppression

A

True

122
Q

Chicken anaemia virus is transmitted both horizontally and vertically

A

True

123
Q

Atrophy of the thymus is a post mortem finding of Chicken Infectious Anaemia virus

A

True

124
Q

Infectious Chicken anaemia virus can cause clinical signs only in layer hens.

A

False

125
Q

Infectious chicken anaemia virus causes clinical signs in chickens of 1 to 4 weeks of age

A

True

126
Q

For prevention of infectious chicken anaemia, live attenuated vaccine is available

A

True

127
Q

Infection of day-old chickens with the chicken anaemia virus leads to immunosuppression

A

True

128
Q

Chicken anaemia virus infection can result in high mortality of chickens over 3 weeks of age

A

False

129
Q

In Chicken Infectious anaemia, most symptoms are observed in the first month

A

True

130
Q

Chicken Infectious anaemia involves destruction of the lymphoid and myeloid cells

A

True

131
Q

Chicken Infectious anaemia virus induces apoptosis of activated T-cells

A

True

132
Q

Pigeons can be infected by Chicken Infectious anaemia virus

A

False

133
Q

Chicken Infectious anaemia virus does not replicate in the thymus

A

False

134
Q

Chicken Infectious anaemia in day-old chickens causes a long-lasting immunosuppression.

A

True

135
Q

Chicken Infectious anaemia virus is a Gyrovirus

A

True

136
Q

Chicken anaemia virus infection can cause death of chickens below 3 weeks of age

A

True

Epidemiology (8 decks)

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