Virus Flashcards

1
Q

Birnaviridae envelope?

A

None

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2
Q

Birnaviridae genome?

A

RNA

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3
Q

Birnaviridae shape

A

Icosahedral symmetry

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4
Q

Birnaviridae in environment?

A

Stable

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5
Q

Birnaviridae replication?

A

In cytoplasm

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6
Q

Most important Birnaviridae genera

A

Avibirnavirus and Aquabirnavirus

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7
Q

Most important Avibirnavirus virus

A

Infectious bursal disease virus

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8
Q

Infectious bursal disease virus causes

A

Infectious bursal disease in immature chicken

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9
Q

Most important Aquabirnavirus

A

Infectious pancreatic necrosis virus

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10
Q

Infectious pancreatic necrosis virus causes

A

Infectious pancreatic necrosis in salmonid fish

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11
Q

Infectious bursal disease also known as

A

Gumoro disease

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12
Q

Infectious bursal disease virus main pathway

A

Oral and respiratory

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13
Q

Infectious bursal disease targets in the body

A

B lymphocytes and their precursors in the bursa of Fabricius

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14
Q

The outcome of the infectious bursal disease

A

immunosuppression

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15
Q

The forms of the infectious bursal disease

A

clinical and subclinical

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16
Q

Diagnosis of clinical form of the infectious bursal disease

A

Swollen bursa of fabricius at post mortem inspection

17
Q

Diagnosis of the subclinical form of the infectious bursal disease

A

Immunofluorescence: smear of the frozen cut section of the bursa of fabricius can have viral antigen
ELISA: macerated bursal tissue
Viral isolation: bursa, spleen, feces

18
Q

Infectious pancreatic necrosis affects mainly

A

youg salmonid fish less than 6 months, adults can be carriers

19
Q

Transmission of the infectious pancreatic necrosis

A

Horizontal by water, also vertical

20
Q

Clinical signs of infectious pancreatic necrosis

A

Swollen abdomen, anorexy, darkening of the epidermis, corkscrew swimming pattern

21
Q

Post-mortem lesions of infectious pancreatic necrosis

A

Pancreatic necrosis, thick mucus in the intestines

22
Q

Diagnosis of the infectious pancreatic necrosis

A

ELISA, PCR, IFAT, virus culture, histopathological smears of pancreas

23
Q

Prevention of the infectious pancreatic necrosis

A

High water quality
Low stocking density
No mixing of batches

24
Q

Transcription of Birnaviridae

A

inside virion with viral polymerase

25
Q

Prevention of the infectious bursal disease

A

2 vaccinations