Fish Viruses (Exam 5)

Question 1

List the 4 important fish viruses discussed.

Answer 1

1. Infectious Pancreatic Necrosis Virus
2. Viral Nervous Necrosis Virus
3. Spring Viremia of Carp Virus
4. Infectious Salmon Anemia Virus

Question 2

Infectious Pancreatic Necrosis Virus (IPNV) mainly infects ________.

Answer 2

salmonids

Question 3

Infectious Pancreatic Necrosis Virus is within the family _________ and genus ________.

Answer 3

Birnaviridae
Aquabirnavirus

Question 4

Infectious Pancreatic Necrosis Virus is (enveloped/non-enveloped) (ss/ds) (linear/circular) (DNA/RNA) virus.

Answer 4

non-enveloped ds linear RNA virus

Question 5

(T/F) Infectious Pancreatic Necrosis Virus can be transmitted horizontally in water or vertically in eggs.

Answer 5

True

Question 6

(T/F) Infectious Pancreatic Necrosis Virus causes 100% mortality.

Answer 6

True

Question 7

Which 4 regions of the body does Infectious Pancreatic Necrosis Virus affect?

Answer 7

kidney, spleen, liver, GI mucosa

Question 8

Regarding IPNV: ______ ______ develop abdominal distension, pale gills, hemorrhage, and anorexia while ______ _____ are subclinical, persistent carriers.

Answer 8

trout fingerlings
older fish

Question 9

Viral Nervous Necrosis Virus is also known as Viral _________ & ________.

Answer 9

encephalopathy
retinopathy

Question 10

Viral Nervous Necrosis Virus infects 40 species of ______ and ______ fish worldwide.

Answer 10

marine & freshwater

Question 11

Viral Nervous Necrosis Virus is of family _________ and genus _______.

Answer 11

Nodaviridae
Betanodavirus

Question 12

Viral Nervous Necrosis Virus causes a vacuolating necrosis of ________ in the brain, _______, and ______.

Answer 12

neural cells
retina
spinal cord

Question 13

(T/F) 100% mortality can occur with Viral Nervous Necrosis Virus, especially in older fish.

Answer 13

False - larvae/juveniles

Question 14

(T/F) Viral Nervous Necrosis Virus is transmitted horizontally via water and vertically via eggs.

Answer 14

False (NOT vertically!)

Question 15

(T/F) Vaccination is appropriate control measure for Viral Nervous Necrosis Virus.

Answer 15

False (no vaccine)

Question 16

(T/F) Spring Viremia of Carp Virus is a reportable disease.

Answer 16

True

Question 17

Spring Viremia of Carp Virus is also known as:

Answer 17

swim bladder inflammation

Question 18

Spring Viremia of Carp Virus is transmitted ________ via infected feces, urine, gills, and mucus.

Answer 18

horizontally

Question 19

What animals serve as vectors for Spring Viremia of Carp Virus?

Answer 19

piscivorous birds, fish leeches, lice

Question 20

(T/F) There are NO gross lesions for Spring Viremia of Carp Virus.

Answer 20

False (non-specific lesions)

Question 21

List 3 non-specific gross lesions of Spring Viremia of Carp Virus.

Answer 21

1. ascites
2. congestion
3. petechial hemorrhage

Question 22

Which virus, if infecting a pond, requires destruction of ALL aquatic life?

Answer 22

Spring Viremia of Carp Virus

Question 23

Sea-farmed Atlantic salmon are infected with what virus?

Answer 23

Infectious Salmon Anemia Virus

Question 24

(T/F) Infectious Salmon Anemia Virus a reportable disease.

Answer 24

True

Question 25

Infectious Salmon Anemia Virus is of _______ family and _______ genus.

Answer 25

Orthomyxoviridae
Isavirus

Question 26

Expression of clinical signs of Infectious Salmon Anemia Virus is ________-dependent.

Answer 26

temperature

Question 27

3 common clinical signs/lesions due to Infectious Salmon Anemia Virus are:

Answer 27

1. lethargy
2. cannot swim upright (swim near surface)
3. kidney hemorrhage

Question 28

Which fish virus was the first aquatic disease to have a control program in place?

Answer 28

Infectious Salmon Anemia Virus

Question 29

Which fish virus was the first isolated fish virus?

Answer 29

Infectious Pancreatic Necrosis Virus