Flies

Question 1

What are the 3 flies of veterinary importance in the oestridae family?

Answer 1

Oestrus ovis
Gasterophilus
Hypoderma

Question 2

How does oestrus ovis cause disease in sheep?

Answer 2

Nasal bot fly.
Sprays larvae into the nasal openings.
Can make way through the frontal sinus to the brain and causes gid.

Question 3

How does gasterophilus spp. cause disease in horses?

Answer 3

Eggs are laid on the horses legs and licked off.
Lifestages are then carried out in the gastric mucosa.
Can cause obstruction.

Question 4

How does hypoderma spp. cause disease in cattle?

Answer 4

Warble fly
No mouth parts
Only hatch and release eggs, which burrow into the skin.

Question 5

What is the fly of veterinary importance within the calliphagidae family?

Answer 5

Lucilia sericata

Question 6

What disease is caused in sheep by lucilia sericata?

Answer 6

Fly strike.

This can be prevented by daily inspection.

Question 7

What predisposes rabbits to infection by lucilia sericata?

Answer 7

Diet - starch rich diet can increase diarrhoea.

Grooming - can make faecal soiling more likely.

Question 8

What are the 2 species of flies of veterinary importance within the hippoboscoidea family?

Answer 8

Sheep ked - melophagus ovivirus

Forrest fly - hippobosca equina

Question 9

What family are horse flies from?

Answer 9

Tabanidae

Question 10

What are the 4 flies within the muscidae family?

Answer 10

Stable fly - stomoxys calcitrans
Horn fly - haematobia irritans
Hydrotea irritans
Face fly - musca autumnalis

Question 11

What is the stable fly a vector for?

Answer 11

Dermatophilosis

Question 12

What signs are shown by cattle of a horn fly infestation?

Answer 12

Blood loss irritation

Question 13

What disease does hydrotea irritans contribute to?

Answer 13

Transmission of summer mastitis.

Broken head in sheep - causes irritation, damages skin, fluid loss

Question 14

What disease can be caused by face fly?

Answer 14

Infectious bovine keratoconjunctivitis.

Feeds on the secretions of the eyes, nose and mouth.

Question 15

What disease is transmitted by the sand fly?

Answer 15

Canine leishmaniosis

Question 16

What is the cause of disease with culicoides flies?

Answer 16

Biting midges.

Can cause hypersensitivity.
Vector for 53 viruses and 19 nematodes.
Overwinter as L4
Adults only live for 20 days.
Blown by the wind.