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Epidemiology Final > Astro, Toga, Flavi > Flashcards

Astro, Toga, Flavi Flashcards

1
Q

Avian nephritis is caused by astroviruses

A

True

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2
Q

The mortality of avian nephritis is 50-60%

A

False

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3
Q

Avian nephritis replicates in the gut

A

True

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4
Q

Broilers are regularly vaccinated against avian nephritis virus

A

False

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5
Q

Urate deposition is a postmortem lesion of avian nephritis

A

True

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6
Q

Clinical signs of avian nephritis can be seen in the first four weeks of life T

A

True

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7
Q

Avian nephritis virus usually causes diseases in chickens of 1-3 weeks of age

A

True

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8
Q

Avian nephritis is more frequent in waterfowl than in chicken

A

False

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9
Q

Avian nephritis virus caused by a picornavirus

A

False

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10
Q

Only chickens are susceptible to avian nephritis virus

A

True

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11
Q

Avian nephritis virus is transmitted by rodents

A

False

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12
Q

Chickens are frequently seropositive for avian nephritis

A

True

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13
Q

Avian nephritis virus caused by a picornavirus.

A

False

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14
Q

Attenuated vaccines are used for the prevention of chicken from avian nephritis virus

A

False

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15
Q

Togaviruses are strongly resistant to the environmental conditions

A

False

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16
Q

Togaviruses are transmitted by mosquitoes

A

True

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17
Q

The clinical appearance of togavirus infection is dose dependent

A

True

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18
Q

Togaviruses cause airborne infection

A

False

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19
Q

Togaviruses cause encephalomyelitis in horses in East-Asia and in Australia only

A

False

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20
Q

Several togaviruses are zoonotic agents

A

True

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21
Q

No vaccines are available against togaviruses

A

False

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22
Q

Horse encephalomyelitis viruses are transmitted by ticks

A

False

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23
Q

Abortion is the main clinical sign of togavirus infection results in abortion of horses

A

False

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24
Q

The leading clinical sign of togavirus infection is the frothy nasal discharge

A

False

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25
Q

Togavirus infection in horses results in hepatitis

A

False

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26
Q

In the geographic distribution of equine togavirus migratory birds have an important role

A

True

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27
Q

Rodents serve as reservoirs for the Western equine encephalomyelitis virus

A

True

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28
Q

Rodents serve as reservoirs for Venezuelan horse encephalomyelitis virus

A

False

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29
Q

Equine encephalomyelitis viruses are zoonotic

A

True

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30
Q

Equine encephalomyelitis viruses can cause asymptomatic infections

A

True

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31
Q

Horses encephalomyelitis vaccines defend against African horse sickness (cross protection)

A

False

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32
Q

Horse encephalomyelitis viruses are transmitted by ticks

A

False

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33
Q

Birds serve as reservoirs for the Eastern equine encephalomyelitis virus

A

True

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34
Q

Equine encephalomyelitis viruses can cause lameness in horses

A

True

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35
Q

Birds serve as reservoirs for Venezuelan horse encephalomyelitis virus

A

False

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36
Q

Western equine encephalitis causes the highest mortality

A

False

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37
Q

Equine encephalitis can be diagnosed easily by gross pathology

A

False

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38
Q

In Venezuelan horse encephalitis enteric symptoms can be observed too

A

True

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39
Q

Recovery from equine horse encephalitis induces immunity that lasts only 1 year

A

False

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40
Q

Equine encephalitis vaccines are available only for humans

A

False

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41
Q

An early sign of Eastern encephalomyelitis is biphasic fever

A

True

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42
Q

Eastern equine encephalomyelitis virus infects only horses F

A

False

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43
Q

Mosquitoes are the principle vectors of equine encephalomyelitis viruses

A

True

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44
Q

Equine encephalomyelitis can cause abortion in human

A

True

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45
Q

Wild birds are involved in the transmission cycle of eastern equine encephalomyelitis

A

True

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46
Q

Ticks are involved in the transmission cycle of EEE

A

False

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47
Q

Viral equine encephalomyelitis is usually diagnosed on the basis of clinical signs

A

False

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48
Q

In endemic countries vaccines are available against equine viral encephalomyelitis

A

True

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49
Q

Some strains of Venezuelan horse encephalitis virus can be transmitted from horse to other hosts

A

True

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50
Q

Vaccination of horses in the Americas is used to prevent togavirus infections

A

True

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51
Q

The Equine encephalitis virus may cause abortion

A

True

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52
Q

The Eastern Equine Encephalitis is present in Japan and Korea

A

False

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53
Q

Mosquitoes are the principal vectors of the Western Equine encephalitis

A

True

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54
Q

No characteristic gross pathology lesions are seen in Equine encephalitis caused by Togaviruses

A

True

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55
Q

Eastern, Western and Venezuelan Equine encephalitis viruses are zoonotic agents

A

True

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56
Q

Togaviruses caused encephalomyelitis of horses occurs frequently worldwide

A

False

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57
Q

The host range of horse encephalomyelitis togaviruses is wide

A

True

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58
Q

American horse encephalomyelitis most frequently cause clinical signs is birds, horses and humans

A

True

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59
Q

Humans are not susceptible to horse encephalomyelitis togaviruses

A

False

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60
Q

American horse encephalomyelitis viruses represent several types and subtypes

A

True

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61
Q

Vectors of American horse encephalomyelitis Togaviruses are mosquitoes

A

True

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62
Q

Main means of control of American borse encephalomyelitis are mosquito control and vaccines

A

True

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63
Q

Vaccines cannot be used to prevent Togaviruses caused encephalomyelitis of horse

A

False

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64
Q

An early sign of Eastern encephalomyelitis is biphasic fever

A

True

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65
Q

Mainly ticks are the vectors of Equine encephalomyelitis viruses

A

False

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66
Q

Serological cross-reactions are seen between certain encephalomyelitis viruses

A

True

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67
Q

Equine encephalomyelitis viruses cause disease in horse populations worldwide

A

False

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68
Q

Equine encephalomyelitis outbreaks are usually emerging in summer or rainy seasons

A

True

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69
Q

After recovery from acute viral encephalomyelitis permanent lesions may remain in horses

A

True

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70
Q

The equine encephalomyelitis viruses are zoonotic agents

A

True

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71
Q

Togavirus infections can unambiguously be diagnosed based on clinical signs and patholog

A

False

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72
Q

In Europe vaccination of horses against equine encephalomyelitis is compulsory

A

False

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73
Q

Togavirus infection results in abortion of horses

A

False

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74
Q

Horse encephalitis occurs only in America

A

False

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75
Q

Chikungunya virus causes joint pains, fever, rash and haemorrhages in humans

A

True

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76
Q

Chikungunya virus is transmitted by the Asian tiger mosquito

A

True

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77
Q

Serological cross reactions frequently occur between related flaviviruses

A

True

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78
Q

Flavivirus from distinct serotypes without serological cross-reactions

A

False

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79
Q

Many of the flaviviruses are zoonotic agents

A

True

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80
Q

Pestiviruses are zoonotic

A

False

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81
Q

Pestiviruses are arboviruses

A

False

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82
Q

Viruses of the Pestivirus genus are more resistant in the environment than the members of the Flavivirus genus

A

True

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83
Q

Viruses of the Pestivirus genus are more resistant in the environment than the other members of the Flavivirus genus

A

True

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84
Q

Yellow fever virus and Dengue virus are human pathogens

A

True

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85
Q

Flaviviruses are resistant to lipid solvents

A

False

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86
Q

Louping ill is seen in cattle in North America

A

False

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87
Q

The louping ill was introduced to Australia to control rabbit population

A

False

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88
Q

The louping ill is seen in cattle in Great Britain and Scandinavia

A

False

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89
Q

The principle vector of the Louping ill virus is Rhipicephalus appendiculatus

A

False

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90
Q

Louping ill is present only in tropical and subtropical countries.

A

False

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91
Q

Louping ill is most frequently seen in sheep

A

True

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92
Q

Abortion and foetal malformations are the most typical signs of louping ill in sheep

A

False

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93
Q

The Louping Ill is seen in rabbits in Australia

A

False

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94
Q

Louping ill is usually seen in rabbits

A

False

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95
Q

Differential diagnoses of Louping-Ill: Listeria, Rabies, Scrapie

A

True

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96
Q

Louping-Ill is a disease of swine

A

False

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97
Q

Louping ill occurs in the Far-East

A

False

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98
Q

Louping ill is transmitted by mosquitoes and midges

A

False

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99
Q

The tick borne encephalitis is endemic in central Europe

A

True

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100
Q

The main vectors of tick borne encephalitis virus are sylvatic mammalian species

A

False

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101
Q

The tick borne encephalitis virus can be transmitted via consumption of raw milk

A

True

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102
Q

The consumption of raw goat milk is a possible source of human tick borne encephalitis

A

True

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103
Q

Biphasic fever is a characteristic of TBE

A

True

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104
Q

The Tick-borne encephalitis is widespread in North America F

A

False

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105
Q

Consumption of contaminated, raw goat milk is a possible source of human tick-borne encephalitis virus infection

A

True

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106
Q

Inactivated vaccines are used for the prevention of humans from tick-borne encephalitis

A

True

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107
Q

The main vectors of the tick-borne encephalitis virus are sylvatic mammalian species

A

False

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108
Q

The main vectors of the tick-borne encephalitis virus are Hyalomma and Dermocentor species

A

False

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109
Q

The tick-borne encephalitis virus is resistant to detergents

A

False

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110
Q

Mainly birds develop tick-borne encephalitis

A

False

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111
Q

Tick-borne encephalitis is mainly seen in humans

A

False

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112
Q

Tick-borne encephalitis viruses are present only in tropical regions

A

False

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113
Q

Inactivated vaccines are available against tick-borne encephalitis for humans

A

True

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114
Q

The tick-borne encephalitis is widespread in North America

A

False

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115
Q

Tick-borne encephalomyelitis mainly occurs clinically in humans

A

True

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116
Q

Tick-borne encephalomyelitis occurs throughout Europe and Asia

A

True

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117
Q

Tick-borne encephalomyelitis exists as natural foci infections

A

True

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118
Q

Ruminants are long term carries of tick-borne encephalomyelitis virus

A

False

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119
Q

Tick-borne encephalomyelitis most frequently is seen clinically in ruminants

A

False

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120
Q

Occasionally tick-borne encephalomyelitis virus can be transmitted to humans via consuming raw milk

A

True

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121
Q

Tick-borne encephalomyelitis occurs seasonally

A

True

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122
Q

For humans inactivated tick-borne encephalomyelitis virus vaccines are also available

A

True

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123
Q

Migratory birds play a role in the transmission of West Nile virus

A

True

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124
Q

Mammals are mostly accidental hosts of West Nile Fever virus

A

True

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125
Q

West Nile Fever is a notifiable disease

A

True

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126
Q

In West Nile epidemics wild bird mortality is usually observed before horse and human cases can be detected

A

True

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127
Q

To prevent West Nile Fever, vaccine is available for horses

A

True

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128
Q

The West Nile Fever can be diagnosed unambiguously by the clinical signs

A

False

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129
Q

The West Nile Fever virus infects mostly swine and cattle

A

False

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130
Q

The West Nile virus may cause encephalitis in humans and in horses

A

True

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131
Q

Horses and humans do not play a significant role in the transmission of West Nile virus

A

True

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132
Q

The West Nile fever epidemics occur usually at the end of summer and during Autumn

A

True

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133
Q

WNV typically causes reproductive problems in cattle

A

False

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134
Q

West Nile fever can be unambiguously diagnosed on the basis of clinical signs

A

False

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135
Q

Fomites play the most significant role in the transmission of WNV

A

False

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136
Q

West Nile Virus is only present in Africa

A

False

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137
Q

Wild birds are the natural hosts of West Nile virus

A

True

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138
Q

WNV causes central nervous signs in 80-90% of the infections

A

False

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139
Q

WNV outbreaks usually develop in the end of summer and in autumn

A

True

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140
Q

WNV cannot be isolated in cell cultures

A

False

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141
Q

Vaccines are available for the prevention of horses from WNV infections

A

True

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142
Q

Horses are the reservoirs host of WNV

A

False

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143
Q

Different genetic lineages of West Nile virus are circulating in Europe

A

True

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144
Q

Various strains of WNV, belonging to different genetic lineages are circulating in Europe

A

True

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145
Q

There is no vaccine available for humans against WNV infection yet

A

True

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146
Q

Mosquitoes are the principle vectors of the WNV T

A

True

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147
Q

The weather does not influence the occurrence of WNV outbreaks

A

False

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148
Q

The sero-diagnostics of WNV is complicated by cross-reactions with related flaviviruses

A

True

149
Q

Certain predatory bird species are particularly sensitive to WNV infections

A

True

150
Q

The use of repellents may reduce the risk of infection with WNV

A

True

151
Q

The weather influences the emergence of West Nile Virus outbreaks, through its effect on mosquito propagation dynamics

A

True

152
Q

Laboratory diagnosis should confirm the aetiology of West Nile encephalitis

A

True

153
Q

West-Nile fever practically is restricted to Africa

A

False

154
Q

The most important maintaining hosts of West Nile fever virus are water birds

A

True

155
Q

Clinical signs of West Nile fever are most frequently seen in birds, horses and humans

A

True

156
Q

Neurological signs develop only in a small percentage of the diseased animals

A

True

157
Q

West Nile fever occurs worldwide

A

True

158
Q

Vectors of West Nile fever virus are different mosquito species

A

True

159
Q

The host range of West Nile virus is very wide

A

True

160
Q

Humans are not susceptible to West Nile disease virus

A

False

161
Q

The sero-diagnostics of West Nile virus is complicated by cross-reactions with related flaviviruses

A

True

162
Q

The West Nile Virus is genetically uniform, but at least 15 serotypes are known

A

False

163
Q

Certain predatory bird species are particularly sensitive to West Nile virus infections

A

True

164
Q

The use of repellents may reduce the risk of infection with West Nile virus

A

True

165
Q

Fomites play the most significant role in the transmission of the West Nile Virus

A

False

166
Q

West Nile Virus typically causes reproductive problems in cattle

A

False

167
Q

There are no available vaccinations for humans against West Nile Virus yet

A

True

168
Q

The principal vectors of the West Nile Virus are midges

A

False

169
Q

Different genetic lineages of West Nile Virus are circulating in Europe

A

True

170
Q

West Nile Virus mainly causes diarrhoea in sheep

A

False

171
Q

West Nile Virus causes central nervous signs in 80-90% of the infections

A

False

172
Q

West Nile Virus outbreaks usually develop in the end of summer and in autumn

A

True

173
Q

West Nile Virus cannot be isolated in cell cultures

A

False

174
Q

West Nile Virus is the only known zoonotic flavivirus

A

False

175
Q

The Japanese encephalitis virus causes abortion in swine

A

True

176
Q

The Wesselsbron disease causes meningoencephalitis in turkey

A

False

177
Q

The yellow fever virus causes liver damages

A

True

178
Q

The zika virus causes fever, rash and conjunctivitis in humans

A

True

179
Q

BVDV can be frequently detected in the background of respiratory diseases

A

True

180
Q

BVD virus is particularly resistant to disinfectants

A

False

181
Q

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

A

False

182
Q

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

A

True

183
Q

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

A

True

184
Q

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

A

False

185
Q

In utero infection with non cytopathic BVDV can cause immunotolerance

A

True

186
Q

In utero infection with cytopathic BVDV strain results immunotolerant calves

A

False

187
Q

Swine are not susceptible to BVD F

A

False

188
Q

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

A

True

189
Q

Pigs infected with BVDV turn seropositive to classical swine fever

A

True

190
Q

Persistently infected cattle can maintain BVDV in a farm

A

Ture

191
Q

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

A

False

192
Q

Non-cytopathic BVD virus strain can mutate and become cytopathic

A

True

193
Q

The BVD virus can infect pigs also

A

True

194
Q

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

A

True

195
Q

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

A

False

196
Q

Intrauterine BVD virus infection always causes abortion

A

False

197
Q

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

A

True

198
Q

In sheep BVDV causes symptoms similar to border disease

A

True

199
Q

Mucosal disease can develop in cattle persistently infected with BVDV

A

True

200
Q

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

A

True

201
Q

BVDV can be transmitted by semen

A

True

202
Q

BVD virus cannot be transmitted via artificial insemination

A

False

203
Q

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

A

True

204
Q

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

A

True

205
Q

Bloody diarrhoea is a clinical sign of the mucosal disease

A

True

206
Q

BVD virus cannot be propagated in cell cultures

A

False

207
Q

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

A

False

208
Q

BVD and mucosal disease are caused by the same viral species

A

True

209
Q

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

A

True

210
Q

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

A

True

211
Q

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

A

True

212
Q

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

A

False

213
Q

Two genotypes of the BVDV are known

A

True

214
Q

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

A

True

215
Q

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

A

True

216
Q

BVDV infection may cause immunosuppression

A

True

217
Q

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

A

False

218
Q

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

A

False

219
Q

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

A

True

220
Q

Wild birds are the natural hosts of the BVDV

A

False

221
Q

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

A

True

222
Q

Only inactivated vaccines can be used for the prevention against BVD

A

False

223
Q

The BVD virus genotype 2 is less virulent than genotype 1

A

False

224
Q

The BVD virus cannot be transmitted via artificial insemination

A

False

225
Q

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

A

True

226
Q

BVD virus can cause severe damage to fetuses in pregnant cows

A

True

227
Q

Only cattle is susceptible to BVD virus

A

False

228
Q

BVD virus exists in several serotypes

A

False

229
Q

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

A

True

230
Q

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

A

True

231
Q

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

A

True

232
Q

BVDV cannot be propagated in cell cultures

A

False

233
Q

BVDV is practically sensitive to disinfectants

A

True

234
Q

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

A

False

235
Q

Bovine Viral Diarrhoea cannot be transmitted with AI

A

False

236
Q

The BVD virus typically damages endothelial epithelial- and lymphatic tissues

A

True

237
Q

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

A

False

238
Q

Cytopathic BVDV strains cause mucosal disease in immune-tolerant calves

A

True

239
Q

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

A

False

240
Q

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

A

False

241
Q

The Border disease virus causes pneumonia in sheep

A

False

242
Q

The border disease is present only in the United Kingdom

A

False

243
Q

The border disease virus frequently causes encephalitis in ewes

A

False

244
Q

Goats can be infected with border disease

A

True

245
Q

Border disease in most frequently seen in horses

A

False

246
Q

In utero border disease virus infection may cause immunotolerance

A

True

247
Q

The Border disease is a haemorrhagic, respiratory syndrome in sheep

A

False

248
Q

Border disease of sheep is mainly characterized by foetal damages

A

True

249
Q

Border disease appears as foetal damage in pregnant ewes

A

True

250
Q

Border disease is a respiratory and enteric disease of lambs

A

False

251
Q

Border disease occurs in Hungary

A

True

252
Q

Border disease causes abortion in ewes

A

True

253
Q

Border disease of sheep can be controlled by screening for carriers

A

True

254
Q

Haemorrhagic enteritis is a characteristic pathological lesion of Classical swine fever

A

True

255
Q

Classical Swine Fever is frequently complicated with bacterial infections

A

True

256
Q

Classical swine fever virus can be transmitted by raw pork products

A

True

257
Q

Classical swine fever virus can retain its infectivity for 6 months in frozen meat

A

True

258
Q

The CSFV may survive in frozen meat for months

A

True

259
Q

During necropsy enlarged bloody lymph nodes can be seen in Classical swine fever cases

A

True

260
Q

Because of endothelial damage Classical swine fever results in haemorrhages

A

True

261
Q

In acute Classical swine fever, at the beginning obstipation, later diarrhoea can be observed

A

True

262
Q

Classical swine fever targets the bone marrow stem cells

A

True

263
Q

Erysipelas and Porcine circovirus 2 infections may cause clinical signs and pathology lesions similar to CSF

A

True

264
Q

Weakness of the hind legs and ataxia are clinical signs of Classical Swine Fever

A

True

265
Q

Ischaemic infarcts at the edges of the spleen are postmortem lesions of subacute Classical
Swine Fever

A

True

266
Q

The boutons in the intestines are characteristic lesions in subacute Classical Swine Fever

A

True

267
Q

Kidney haemorrhage is a characteristic lesion of Classical Swine Fever

A

True

268
Q

Hemorrhages are the most typical lesions of acute CSF

A

True

269
Q

During necropsy of acute Classical swine fever cases, haemorrhages can be seen in the gastric mucosa

A

True

270
Q

Among Classical Swine Fever clinical signs CNS and eye problems can be observed

A

True

271
Q

The CSFV causes central nervous signs only in suckling piglets

A

False

272
Q

lassical swine fever infection during the first half of pregnancy results in the birth of immunotolerant piglets

A

True

273
Q

CSF infection during the first of half of pregnancy can lead to abortion

A

True

274
Q

Classical swine fever infection in the second half of the pregnancy leads to foetal development problems

A

False

275
Q

Shedding of Classical swine fever virus starts 1 week after the infection

A

False

276
Q

The shedding of CSFV begins 1-2 days after the appearance of clinical signs

A

True

277
Q

The domestic swine population of most European countries are free from CSF

A

True

278
Q

Classical swine fever causes oronasal infection T

A

True

279
Q

Classical swine fever can be transmitted by mating T

A

True

280
Q

CSF can cause transplacental infections

A

True

281
Q

CSFV may case reproductive disorders

A

True

282
Q

Classical swine fever targets lymphatic tissues

A

True

283
Q

CSF infections result in thrombocytopenia

A

True

284
Q

Clinical signs of Classical Swine fever are mainly seen in 6-12 week old piglets in vaccinated herds

A

True

285
Q

Classical swine fever infection during the first half of pregnancy can lead to abortion

A

True

286
Q

Wild boars play the main role in the maintenance of CSF virus in endemic areas

A

True

287
Q

Wild boar may play a role in the maintenance and spread of CSFV

A

True

288
Q

In Europe it is obligatory to vaccinate against Classical swine fever

A

False

289
Q

In acute Classical swine fever skin haemorrhages and bloody nasal discharge can be observed

A

True

290
Q

Normal sized spleen can be observed in uncomplicated cases of subacute Classical swine fever

A

True

291
Q

Classical swine fever infection results in immunosuppression T

A

True

292
Q

All wild type strains of classical swine fever virus are highly virulent

A

False

293
Q

Six distinct serotypes of CSF virus are recognized so far

A

False

294
Q

CSF virus is an arbovirus

A

False

295
Q

CSF virus is a zoonotic agent

A

False

296
Q

Pigs shed CSF virus only during the clinical stage of the disease

A

False

297
Q

Central nervous signs might be seen in classical swine fever

A

True

298
Q

Based on pathology and clinical signs, chronic classical swine fever is easy to diagnose

A

False

299
Q

In vaccinated herds we mostly see the CSF clinical signs in 6-12 weeks old piglets

A

True

300
Q

Fomites do not play a role in the transmission of the Classical Swine Fever Virus

A

Falsse

301
Q

Transplacental infection with CSFV may cause immunotolerance in new-born piglets

A

True

302
Q

Swine shed CSFV only in the terminal phase of the disease

A

False

303
Q

Europe is free from CSFV

A

False

304
Q

Classical Swine Fever is always an acute disease with high mortality in wild boars

A

False

305
Q

The large intestine are the earliest lesions in Classical Swine Fever

A

False

306
Q

The diagnosis of Classical Swine Fever is based on paired serum investigations

A

False

307
Q

Porcine circovirus 2 may cause lesions similar to Classical Swine Fever

A

True

308
Q

Low virulence strains of CSFV may cause reproductive problems

A

True

309
Q

CSFV may damage the lymphatic tissues and blood vessel endothelial cells

A

True

310
Q

Swine can shed CSFV in the incubation period

A

True

311
Q

Skin suffusions and haemorrhages are signs of Classical Swine Fever

A

True

312
Q

The clinical signs of African Swine Fever and Classical Swine Fever are very different

A

False

313
Q

Contaminated pork meat can play a role in the transmission of CSFV

A

True

314
Q

Attenuated vaccines are developed for immunization of swine against CSFV

A

True

315
Q

All known strains of the Classical Swine Fever virus are of highly virulence

A

False

316
Q

The Classical Swine Fever may appear in a milder form in wild boar than in domestic swine

A

True

317
Q

Erysipelas and Porcine circovirus 2 infections may cause clinical signs and pathology lesions similar to Classical Swine Fever

A

True

318
Q

Classical swine fever virus is shed with faces, when boutons appear in the intestines

A

False

319
Q

Classical swine fever can be eradicated from wild boar populations by oral vaccination

A

False

320
Q

Classical swine fever virus is rarely complicated by secondary infections

A

False

321
Q

Classical swine fever can be diagnosed easily by the characteristic symptoms and lesions

A

False

322
Q

Domestic swine stocks are free of classical swine fever in most of the European countries

A

True

323
Q

Acute classical swine fever can cause haemorrhagic pneumonia

A

True

324
Q

Classical swine fever virus doesn’t induce neutralizing antibody production

A

False

325
Q

Classical swine fever virus is inactivated in chilled meat at -20°C

A

False

326
Q

Classical swine fever virus can cause immunotolerance in swine

A

True

327
Q

Only DIVA vaccines should be used to prevent classical swine fever in swine stocks

A

False

328
Q

Classical swine fever virus causes lympho-histiocytic encephalitis in pigs

A

True

329
Q

Classical swine fever virus causes lympho-histiocytic encephalitis in carnivores

A

False

330
Q

Classical swine fever Virus spreads slowly in the host and causes mainly chronic disease

A

false

331
Q

Complicated forms of the Classical swine fever are rarely seen

A

False

332
Q

The Classical swine fever virus may cause reproductive disorders

A

True

333
Q

Haemorrhages are the most typical lesions of acute Classical swine fever

A

True

334
Q

Classical swine fever can unambiguously diagnosed by the clinical signs and pathology

A

False

335
Q

Domestic swine of most European countries are free from Classical swine fever virus

A

True

336
Q

The Classical swine fever may appear in a milder form in wild boar than in domestic swine

A

True

337
Q

Low virulence strains of CSFV may lead to asymptomatic infection

A

True

338
Q

CSF is spread via infected pigs

A

True

339
Q

Sows infected by CSF will have immunotolerant piglets

A

True

340
Q

Piglets of sows vaccinated against CSF are vaccinated at 6-12 months

A

False

341
Q

To prevent CSF, we vaccinate pigs older than 6 months of age with live vaccine

A

False

342
Q

To prevent CSF we use inactivated vaccines made from the Chinese strain

A

False

343
Q

Shedding may start 2-3 days after first clinical signs

A

False

344
Q

CSF can be prevented by inactivated vaccines

A

False

345
Q

CSF can hardly be distinguished from African swine fever

A

True

346
Q

CSF always causes abortion in pigs

A

False

347
Q

Hungary does not have to make any preventative action against CSF

A

False

348
Q

Incubation of CSF is 8-22 days

A

True

349
Q

CSF was first written about in USA

A

True

350
Q

First symptom of CSF is drooping ears

A

False

351
Q

CSF virus has good resistance

A

True

352
Q

Classical swine fever virus (CSFV) is mainly transmitted by mosquitoes

A

False

353
Q

The presence of CSFV in a herd does not influence reproduction parameters

A

False

354
Q

CSF is frequently complicated with bacterial infections

A

True

355
Q

The clinical signs of CSF and ASF are similar

A

True

356
Q

Central nervous signs are never seen in CSF

A

False

357
Q

Serological cross reactions my occur between BVD virus and CSFV

A

False

358
Q

Only inactivated vaccines are available against CSFV

A

False

359
Q

It is a disease of domestic swine and wild boars, but several other species are also susceptible

A

False

360
Q

Only domestic swine and wild boars are susceptible

A

True

361
Q

Fever, anorexia haemorrhages in the skin and weakness of the hind legs are the most important signs

A

True

362
Q

For prevention state medical steps and vaccination are used in Europe

A

False

363
Q

The CSFV typically damages endothelial- and lymphatic tissues

A

True

364
Q

Boutons in the large intestine are the earliest lesions in CSF

A

False

365
Q

In Europe vaccination of domestic pigs against Classical swine fever is common

A

False

366
Q

Classical swine fever is a notifiable disease in Europe

A

True

367
Q

In Europe vaccination of domestic swine populations against CSF is compulsory

A

False

368
Q

Classical swine fever virus strains are classified into several serotypes

A

False

369
Q

In subacute CSF we can observe signs of pneumonia during necropsies

A

True

Epidemiology Final (7 decks)

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