Bacterial dz Of Thr Skin

Question 1

What are the 2 forms of hairy heel warts/ digital dermatitis?

Answer 1

Erosive/ reactive form (Europe)
Proliferative/ wart-like form (NA)

Question 2

Which bacteria causes hairy heel warts?

Answer 2

Treponema phagedenis, T. vincentii, T. denticola
Dichelobacter nodosus (synergizing agent)
Campylobacter spp. and Prevotella

Question 3

What is the most common location of hairy heel wart?

Answer 3

Flexor commiserate of the interdigital space
Less common : dorsal surface of the foot and around dewclaws

Question 4

Dermatophilosis (Rain Scald or Lumpy Wool)

Answer 4

Caused by Dermatophilus congolensis (G+, filamentous, branching)

Question 5

Predisposing factors for dermatophilosis

Answer 5

Cannot penetrate healthy skin
Prolonged wetting
Mechanical damage to the skin

Question 6

Gross lesions of dermatophilus

Answer 6

Raised, circular, thick, laminated, gray-brown scale crusts penetrated by tufts of hair
Underlying epidermis moist and red

Question 7

Where are dermatophilus lesions located?

Answer 7

Along the dorsal midline between the withers and rump
Laterally onto the flanks, thoracic wall, shoulders and neck

Question 8

Pyoderma

Answer 8

Bacterial infection of the skin producing pus
Primary/ simple or secondary/ complex and superficial or deep

Question 9

Primary/ simple pyoderma

Answer 9

Caused by one time or single event with a specific dz pattern (flea allergy)

Question 10

Secondary/ complex pyoderma

Answer 10

Subsequent to reoccurring event or underlying dz (demodex, hypothyroidism)

Question 11

What causes pyoderma?

Answer 11

Staph. Pseudintermedius

Question 12

Common areas of pyoderma

Answer 12

Lip, facial, vulvar, tail and neck folds, axillary area, dorsal or plantar interdigital areas
Pressure points (elbows snd hocks)

Question 13

Superficial pyoderma

Answer 13

Epidermis and upper infundibulum of hair follicles
Heals without scaring
Short duration

Question 14

Gross lesions associated with superficial pyoderma

Answer 14

Erythema, alopecia, papules, pustules, crusts, epidermal collarettes,

Question 15

Microscopic lesions associated with superficial pyoderma

Answer 15

Intradermal pustular dermatitis (impetigo)
Superficial folliculitis
Neutrophils

Question 16

Deep pyoderma

Answer 16

Involves the hair follicles, dermis , +/- subcutis
Heals with scarring, involves regional LNs, systemic illness

Question 17

Gross lesions of deep pyoderma

Answer 17

Pustules with erect hairs emerging from center
SQ nodules, abscesses, ulcers, fistulous tracts

Question 18

Microscopic lesions of deep pyoderma

Answer 18

Deep folliculitis
Nodular to diffuse suppurative or pyogranulomatous dermatitis or panniculitis

Question 19

Porcine impetigo (Greasy Pig Dz, exudative epidermatitis)

Answer 19

Staph. Hyicus
Predisposing factors: cutaneous lacerations and poor nutrition

Question 20

Lesions associated with porcine impetigo

Answer 20

Gross: thickened epidermis with scaling
Histo: sub corneal pustular dermatitis extending to hair follicles

Question 21

Swine erysipelas (Diamond skin Dz)

Answer 21

Erysipelothrix rhusiopathiae
G+ bacillus
Acute (highly fatal septicemia) and chronic dz

Question 22

Pathogenesis of diamond skin dz

Answer 22

Cutaneous lesions from bacterial embolization to skin during sepsis
Lesions caused by vasculitis, thrombosis, and ischemia
Area of the skin not receiving blood supply

Question 23

Chronic swine erysipelas

Answer 23

Polyarthritis
Endocarditis (vegetative)
Necrosis of the skin (diamond skin)

Question 24

Acute septicemic erysipelas

Answer 24

Petechial hemorrhages over serous membranes
Spleen and LNs may be enlarged and reddened
Bluish discoloration of skin may occur

Question 25

Botryomycosis

Answer 25

Chronic granulomatous dz due to nonfilamentous bacteria
In horses, cattle, sheep, pigs, humans, dogs and cats

Question 26

What causes botryomycosis

Answer 26

Staph, stept, pseudomonas aeruginosa, actinobacillus lignieresii, proteus spp.

Question 27

Gross lesions of botryomycosis

Answer 27

Exudate with tiny, white granules (sulfur granules)

Question 28

Microscopic lesions of botryomycosis

Answer 28

Pyogranulomatous dermatitis and panniculitis
Epithelioid macros and neutros

Question 29

Eosinophilia substance associated with botryomycosis

Answer 29

Splendore- Hoeppli
Coats grains and takes the form of a corona of club-shaped bodies

Question 30

Swine pox virus

Answer 30

Transmitted by contact - sucking louse Haematopinus suis causing skin trauma

Question 31

Gross lesions of swine pox virus

Answer 31

Erythematous papules —> umbilicated pustules
Inflammatory crust sheds and leaves a white scar

Question 32

Differentials of raised nodules on skin of the pig

Answer 32

Greasy pig
Swine pox
Vesicular exanthema of pigs
Zinc deficiency

Question 33

Microscopic lesions of swine pox virus

Answer 33

Marked epithelial hyperplasia
Crust formation
Ballooning degeneration
Eosinophilic intracytoplasmic IBs

Question 34

Contageous ecthyma

Answer 34

Orf, sore mouth, contagious pustular dermatitis
In young sheep and goats caused by parapoxvirus

Question 35

Lesions of Contageous ecthyma

Answer 35

Macule, papule, vesicle, umbilicated pustule, crust, scar

Question 36

What are lesions of Contageous ecthyma invaded by

Answer 36

Larvae of screwworm fly (Cochliomyia hominivorax) or Fusobacterium necrophorum or Dermatophilus congolensis