Pyoderma Flashcards
Give the bacteria involved in pyoderma..
Staphs
S. psuedintermedius
Other gram positives (e.g. strep)
Gram negatives
Coliforms
Pseudomonas
Proteus
Why do dogs get staphloccal pyoderma?
Imbalance between skin defences and virulence of commensal flora
Describe recurrent pyoderma
> 3 episodes per year
Why are dogs predisposed to bacterial folliculitis?
Thin skin with little intercellular emulsion
Hair follicles lack sebum plugs
How is pyoderma diagnosed?
History
Clinical signs
Cytology
Bacterial culture and sensitivity
What is the most common cause of pyoderma?
The coagulase+ve Staphylococcus adapted to the host species
By what is superficial pyoderma also known?
Folliculitis
By what is deep pyoderma also known?
Furunculosis
Cellulitis
By what is pyotraumatic dermatitis also known?
Hot spot
Acute moist dermatitis
Describe pyotraumatic dermatitis…
Disruption of stratum corneum and bacterial invasion with underlying pruritic problem often seen in larger dogs.
Describe intertrigo
Friction in skin folds
Bacteria not invading viable tissue
Linked to breeding and obesity
Inflammation
Outline treatment of localised lesions associated with superficial pyoderma…
Creams/gels/ointments
Fusidic acid (ant-staph) Silver sulfadiazine
Outline treatment for widespread infection associated with superficial pyoderma…
Shampoos
Chlorhexadine (and miconazole)
Outline treatment for mucocuanteous pyderma..
Systemic ABs may be needed
Where does mucocutaneous pyoderma occur?
Perioral
Perivulval
Perianal
What is impertigo?
Interfollicular pustules
In which dogs does impetigo most commonly occur?
Puppies
Describe the typical progression of folliculitis-associated lesions
- Macule
- Papule
- Pustule
- Epidermal collarettes
- Alopecia and pruritis
In which dogs does chin acne tend to occur?
Young
Short-haired
Is chin acne superficial or deep pyoderma?
Deep
Outline sampling for deep pyoderma infections
Avoid surface bacteria
Swab from draining tracts
FNAs from nodules
Tissue culture from biopsies
Outline the important differential diagnosis for pyoderma…
Demodecosis
Dermatophytosis
Pemphigus foliaceus
Sterile granulomatous diseases
Outline the treatment of deep pyoderma
Systemic treatment
Based on C+S
Long courses (4-6 weeks or at least 2 weeks beyond resolution)
Treat underlying causes
