Infectious Bovine Dermatology

Question 1

What causes ringworm?

Answer 1

Trichophyton verrucosum

Question 2

How would you sample a ringworm lesion?

Answer 2

Take a hair pluck sample from the edge of the lesion - for culture and microscopy

Question 3

Name a chewing louse of cattle

Answer 3

Bovicola bovis

Question 4

Name two genus of sucking louse in cattle

Answer 4

Linognathus

Haematopinus

Question 5

Name two problems caused by sucking lice

Answer 5

Anaemia (heavy infestations in young calves)

Mechanical transmission of blood-born pathogens

Question 6

Which cattle mite is zoonotic?

Answer 6

Sarcoptes scabei

Question 7

Which cattle mite causes the most severe disease?

Answer 7

Psoroptes bovis

Psoroptic mange

Question 8

What is the differences in morphology between Chorioptes bovis and Psoroptes bovis?

Answer 8

Psoroptes: Pointed head, trumpet shaped sucked, 3-joint pedicle
Chorioptes: Rounded head, cup-shaped suckers, un-jointed pedicle

Question 9

What are the main 2 problems with flies and ticks?

Answer 9

Worry/avoidance behaviour
Reduces productivity by reducing feeding
Disease vectors

Question 10

What is New Forest Disease? (silage eye)

Answer 10

Infectious bovine keratoconjunctivitis

Moraxella bovis

Question 11

What are the names of the:
Stable fly
Horse fly

Answer 11

Stomoxys calcitrans

Tabanidae

Question 12

What is the name of the head fly?

What does it spread?

Answer 12

Hydrotea irritans

Summer mastitis

Question 13

What do culicoides spp of midges spread?

Answer 13

Bluetongue

Schmallenberg

Question 14

What are the two main groups of treatments for ectoparasites in cattle?

Answer 14

Synthetic pyrethroids

Macrocyclic lactones

Question 15

What bacteria commonly causes abscesses?

Answer 15

Actinobacilli

E.g. truperella pyogenes

Question 16

What does Actinobacillus ligniersii cause in cattle?

Answer 16

Wooden tongue

Question 17

What causes “lumpy jaw” in cattle?

Answer 17

Actinomyces bovis

Underlying osteomyelitis

Question 18

What is another name for “rain scald” in cattle?

What is it caused by?

Answer 18

Streptothricosis
Wet weather
Dermatophilus congolensis

Question 19

What causes ulcerative mammillitis in cattle and where does it occur?

Answer 19

BHV-2

Teats and udder

Question 20

What causes Bovine Papular Stomatitis?

What is the treatment?

Answer 20

Parapox virus

No treatment needed, generally self-limiting

Question 21

Why does molybdenum toxicity cause copper deficiency?

What clinical signs would you see with copper deficiency?

Answer 21

Prevents copper absorption in the rumen and increases amount excreted in urine
Brown tinged coat, with “spectacles” and poor growth rates

Question 22

What plants are associated with photosensitisation?

What type of skin is affected?

Answer 22

St John’s Wort
Ragwort
Unpigmented skin affected (sloughing and serous ooze)

Question 23

What should you do before draining an abscess?

Answer 23

Check its not a haematoma!
Centesis or ultrasound
Aseptic technique important

Question 24

What was Bovine neonatal pancytopenia known as?

What was it associated with?

Answer 24

“Blood sweating disease”

BVD vaccine

Question 25

What is “blane” in cattle?

Answer 25

Sudden onset of vulval oedema

Question 26

What causes calf diptheria?
What pieces of farm equipment is it often associated with?
What is the treatment

Answer 26

Abrasions in the mouth with secondary infection by Fusobacterium necrophorum
Oesophageal feeders
Dosing gun injuries
Procaine penicillin (5-7 days)