Exam 3: Reoviridae

Question 1

What is the vector for bluetongue?

Answer 1

Culicoides midges (biting midges or no-see-ums)

Question 2

What does orthoreovirus cause in poultry?

Answer 2

Arthritis and tenosynovitis

Question 3

What is the genus that affects chickens and turkeys?

Answer 3

Orthoreovirus

Question 4

Which type of reoviridae is involved in seasonal infections?

Answer 4

BTV (Orbivoirus) is seasonal because the vector is Culicoides midges which are most active mid-summer to early fall

Question 5

Describe the genome for reovirus

Answer 5

Monomer, 10-12 segments of linear double-stranded RNA
Total genome length is 18-27 kb pairs
Virion non-enveloped, 3-layered capsid shell

Question 6

Of the 7 major groups of rotavirus (a-g), which ones get in swine?

Answer 6

Groups C and E

Question 7

What is the susceptibility of rotavirus to disinfectants at low pH?

Answer 7

Rotavirus is stable in wide range of environments

Unlike rotavirus, BTV is susceptible to common disinfectants and low pH

Question 8

Describe the serotypes of bluetongue

Answer 8

Multiple serotypes can run in one sheep at one time

25 serotypes ave been identified worldwide with only 5 recognized within the USA

Question 9

How is bluetongue disease controlled?

Answer 9

No treatment for BTV. Control is based on vaccination of animals in endemic areas and decreasing number of insect vectors where possible.
Avoid insects and vaccinate