Bluetongue in Cattle

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AC/1423/15

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1. Blue tongue virus is

1 point

a. An orbivirus

b. Transmitted by Culicoides sp.

c. Only a.

d. Only b

e. Both a and b.

Clear selection

2. In South Africa the following number of serotypes have been identified:

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a. 11

b. 18

c. 22

d. 16

e. 19

Clear selection

3. Bluetongue virus infection has been demonstrated in the following species:

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a. Elephants, camelids, lions, cheetahs.

b. Fallow deer, sika deer and roe deer.

c. Wapiti, pronghorn, white tail deer.

d. All the above.

e. Only ruminants.

Clear selection

4. The virus affects

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a. Only endothelial cells.

b. Endothelial cells, phagocytic cells and dendritic cells.

c. Only dendritic cells.

d. Lymphocytes

e. Plasma cells.

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5. Cattle when infected with blue tongue virus

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a. May act as couriers/reservoirs.

b. Usually causes mortality in as many as 20 -30% of animals.

c. Usually affect as many as 70 % of animals clinically.

d. Do not result in carrier states

e. Do not affect them at all

Clear selection

6. In South Africa the most dominant vector is

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a. Culicoides imicola in the cooler region

b. Culicoides imicola in dung.

c. Culicoides bolitinos.

d. Culicoides sonorensis

e. Culicoides imicola

Clear selection

7. Infection in pregnant cattle will result in

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a. Abortion if infected in late gestation

b. Embryonic death if infected in early stage of pregnancy

c. Lesions of arthrogryposis in 80 % of foetus.

d. No detrimental effect.

e. 100 % of foetus will show persistent infection.

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8. Toggenburg virus is known

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a. To be of low pathogenicity.

b. To be of high pathogenicity

c. To occur in Arab countries

d. Been discovered in early 2008.

e. Both a and d

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9. A diagnosis can be confirmed by

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a. Histology only

b. Histology plus clinical sings

c. Most commonly by means of virus isolation.

d. A combination of histology, serology and PCR screens

e. Serology only.

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10. Carnivores may be most likely infected by

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a. Ingesting Culicoides imicola.

b. Ingesting Culicoides sonorensis.

c. Ingestion of flesh from blue tongue virus infected animals.

d. Close contact with infected herbivores

e. Both a and b.

Clear selection

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