Chapter 21 Lecture

Abscess

Localized colletion of pus

Carbuncle

Deep, pus-filled abscess formed from multiple furuncles

Crust

Dried fluids from a lesion on the surface of the skin

Cyst

Encapsulated sac filled with fluid, semi-solid matter, or gas

Folliculitis

Localized rash due to inflammation of hair follicles

Furuncle (boil)

pus-filled abscess due to infection of a hair follicle

Mascules

Smooth spots of discoloration on the skin

Papules

Small raised bumps on the skin

Pustules

Fluid- or pus- filled bumps on the skin

Vesicle

Small, fluid-filled lesion

Wheal (insect bite)

Swollen, inflamed skin that itches or burns

Conjunctivitis

Inflammation of Conjunctiva

Blepharitis

Inflammation of eyelids

Keratitis

Inflammation of Cornea

Keratoconjunctivitis

Inflammation of Conjunctiva + Cornea

Staphylococcus

Spherical cells arranged in clusters

Staphylococcus

Gram-Positive and Catalase Positive

Staphylococcus

Lack spores and flagella

Staphylococcus

• S. epidermidis

• S. hominis

• S. aureus

Staphylococcus aureus

• Catalase-positive

• Coagulase-positive

• Mannitol fermentation-positive

• High salt tolerance

Staphylococcus aureus

Most common cause of pyogenic infections of the skin

Impetigo

• S. aureus

• S. pyogenes

• Vesicles, pustules, bullae around nose & mouth

• Highly contagious

Staphylococcal Scaled Skin Syndrome (SSSS)

• S. aureus

• Erythema and severe peeling of skin

• Infection of skin & mucus membrane (especially in children)

Coagulase-negative staphylococci

Involved in nosocomial and opportunistic infections

S. epidermidis (staph)

Lives on the skin and mucous membrnaes; endocarditis, bacteremia, UTI

S. saprophyticus (staph)

Infrequently lives on the skin, intestine, and vagina; UTI

Methicillin-Resistant S. aureus

MRSA

Vancomysin-Resistant S. aureus

VRSA