Food Animal Dermatology

Question 1

how many types of bovine papilloma virus are there?

Answer 1

6

Question 2

where can bovine papilloma virus cause warts?

Answer 2

head, neck, trunk
teat-end
alimentary
genital

Question 3

how long do warts usually last?

Answer 3

self-limiting
1-8 months

Question 4

what causes ringworm in cows?

Answer 4

Microsporum sp
Trichophyton sp

Question 5

what does ringworm cause in cows?

Answer 5

non-pruritic crusting alopecia
young: 2 months to 1 year

Question 6

is cow ringworm zoonotic?

Answer 6

yes

Question 7

how can you treat cow ringworm?

Answer 7

topicals: iodine, bleach
systemics: sodium iodide

Question 8

what color does the indicator change to in the presence of dermatophytes in DTM?

Answer 8

red
due to alkaline change in medium

Question 9

what are the three ways a cow can have photosensitization?

Answer 9

primary: liver failure
secondary: phylloerythrin (consume)
congenital

Question 10

how can you treat photosensitization in cows?

Answer 10

remove from sunlight
look for primary agent or reason for liver disease

Question 11

what is the agent of rainscald/dermatophylosis?

Answer 11

Dermatophilus congolensis

Question 12

how can you treat rainscald?

Answer 12

remove crusts
wash with disinfectant shampoo
+/- systemic antibiotics

Question 13

what does squamous cell carcinoma look like?

Answer 13

pink, cobblestone mass at mucocutaneous junction

Question 14

what agents cause udder rot?

Answer 14

Fusobacterium
Bacteriodes
T. pyogenes

Question 15

what are the agents of warble grubs?

Answer 15

Hypoderma lineatum
Hypoderma bovis

Question 16

what are the signs of warble grubs?

Answer 16

spinal cord signs or bloat
stampeding
swellings on back

Question 17

what are the two types of lice?

Answer 17

Anaplura: suckers
Malophaga: biters

Question 18

what are the signs of pediculosis- lice?

Answer 18

pruritus
anemia
failure to thrive

Question 19

which types of mange are reportable?

Answer 19

sarcoptic
psoroptic

Question 20

how is mange/scabies spread?

Answer 20

direct contact

Question 21

what does chorioptic mange look like?

Answer 21

tail mange

Question 22

how can you treat mange/scabies?

Answer 22

systemic: ivermectin
topical: amitraz or moxidectin

Question 23

how can you control cutaneous myiasis- blowfly strike?

Answer 23

crutch
dock
control diarrhea
control fly populations

Question 24

what causes contagious ecthyma/orf/soremouth?

Answer 24

parapox virus

Question 25

what causes warts?

Answer 25

bovine papilloma virus types 1-6 young: 6months to 2years

Question 26

how can you vaccinate for warts?

Answer 26

autogenous commercial

Question 27

does dermatophytosis survive in the environment?

Answer 27

yes

Question 28

how can you diagnose dermatophytosis?

Answer 28

KOH prep DTM

Question 29

how do you perform a KOH test to look for dermatophytosis?

Answer 29

scrape sample cover with 10-20% KOH 15 minutes to gently heat observe for hyphae and spores

Question 30

what is congenital porphyria/pink tooth like?

Answer 30

photosensitization, anemia, poor growth photoactive molecules deposited in skin and teeth

Question 31

how doe secondary photosensitization agents work?

Answer 31

pyrrolizidine alkaloid toxicity

Question 32

what leads to rainscald?

Answer 32

normal flora moisture and prior skin damage

Question 33

what leads to squamous cell carcinoma?

Answer 33

age lack of pigment exposure to sunlight

Question 34

how can you treat squamous cell carcinoma?

Answer 34

surgical removal cryotherapy sooner the better: locally invasive, 10% metastatic

Question 35

how can you treat udder rot?

Answer 35

clean apply drying agent

Question 36

who is lymphosarcoma skin form seen in?

Answer 36

less than 3 years old unrelated to bovine leukosis virus

Question 37

what do warble grubs do?

Answer 37

larvae burrow through skin and migrate overwinter in cow migrate to subcutaneous in sspring pupate during summer and leave

Question 38

what should you be careful of with warble grubs?

Answer 38

when you deworm: do not in winter, because larvae overwinter around spinal cord and esophagus

Question 39

what does sarcoptic mange look like?

Answer 39

intense pruritus

Question 40

what does psoroptic mange look like?

Answer 40

intense pruritus

Question 41

what does demodectic mange cause?

Answer 41

nodules

Question 42

what causes sheep ked?

Answer 42

Malophagus ovinus wingless flies

Question 43

what is the true screwworm?

Answer 43

Cochliomyia hominivorax reportable attacks healthy tissue

Question 44

how long do scabs from contagious ecthyma remain contagious?

Answer 44

up to 15 years

Question 45

is contagious ecthyma/orf/soremouth zoonotic?

Answer 45

yes