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List the bacteria that cause diseases of the skin
  • Staphylococcus epidermidis
  • Staphylococcus aureus
  • Streptococcus pyogenes (Group A Strep or GAS)
  • Pseudomonas aeruginosa
List what I need to know about each bacteria...
  • Morphology
  • Diseases
  • Unique signs/symptoms
  • Reservoir
  • Mode of transmission
  • Vaccines available
  • Nationally notifiable
List the particulars of:

Staphylococcus epidermidis
Morphology: Gram Positive Cocciin clusters - coagulase negative

Diseases: common cause of nosocomial infections

Unique signs/Symptoms: Characterized by ability of S. epidermidis to form biofilms

Reservoir: human (normal skin flora)

Mode of transmission: usually endogenous, can be direct or indirect (fomites)

Vaccines available? No

Nationally notifiable? No
List the particulars of:

Staphylococcus aureus
Morphology: Gram Positive Cocci in clusters - coagulase positive

Diseases: folliculitis, stys (folliculitus of eye), boils, impetigo (crusted skin rash), toxic shock syndrome (TSS)

Unique signs/symptoms: characterized by the fact that S. aureus is coagulase positive - enzyme that causes fibrin clotting (will produce red raised bumps (bite like) and toxin production (will induce fever))

Reservoir: human (S. aureus is normal skin flora)

Mode of transmission: usually endogenous, can be direct or indirect (fomites)

Vaccines available? No

Nationally notifiable? Yes if TSS or VISA/VRSA
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Streptococcus pyogenes
(aka Group A Strep (GAS))
Morphology: Gram Positive cocci in chains

Diseases: erysipelas, necrotizing fasciitis, toxic shock syndrome (TSS), impetigo

Unique signs/symptoms: characterized by ability of GAS to produce enzymes that break down clots, blood cells, and connective tissue (will spread rapidly and destroy tissue (red lines) and toxin production (will induce fever)

Reservoir: human (GAS is pathogen of the repiratory tract)

Mode of transmission: usually endongenous, can be direct or indirect (fomites)

Vaccines available? No

Nationally notifiable? Yes if TSS
List the particulars of:

Pseudomonas aeruginosa
Morphology: Gram Negative bacillus

Diseases: "hot tub dermatitis", chronic ear infections, opportunistic infections in burn patients

Unique signs/symptoms: green pus, forms biofilms, displays multiple antibioic resistance

Reservoir: inanimate (soil, water, air)

Mode of transmission: can be direct of indirect (fomites) - NOTE: tissue must be immunocompromised in some way (obligate opportunistic pathogen)

Vaccines available? No

Nationally notifiable: No
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