Micro chapter14..docx - CHAPTER 14 INFECTIONS OF THE INTEGUMENTARY SYSTEM SOFT TISSUE AND MUSCULOSKELETAL SYSTEM,Bacterial Infections of skin soft

Micro chapter14..docx - CHAPTER 14 INFECTIONS OF THE...

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CHAPTER 14 INFECTIONS OF THE INTEGUMENTARY SYSTEM, SOFT TISSUE, AND MUSCULOSKELETAL SYSTEM Bacterial Infections of skin, soft tissue, muscle , and bone can be classified on an anatomic basis , depending on the layers of skin and soft tissue involved . Abscesses - Localized collection of pus in infected tissue - Defense mechanism to prevent spread of infectious material to other areas Spreading infections - Can be limited to epidermis (e.g., impetigo) or involve subcutaneous fat (e.g., cellulitis ( Necrotizing infections - Result in death of infected tissue - Can spread with alarming rapidity along muscle surfaces; interrupted blood flow Staphylococcal Skin Infections Staphylococcal infections are among the most common bacterial skin infections. Staphylococci are part of the normal flora on the skin and in the nose of healthy adults Furuncles (Boils ( Most common cause is Staphylococcus aureus Exposure to Pseudomonas aeruginosa in hot tubs or pools may also be causative Infection begins in hair follicle (folliculitis ( Collections of furuncles can fuse to form carbuncles
Pseudomonas folliculitis. This is a superficial infection that begins in a hair follicle and subsequently spreads into the underlying dermis Staphylococcal Skin Infections Cellulitis - Acute infection of dermis and subcutaneous tissue - Usually caused by S. aureus, streptococci, or other bacteria - Results from either superficial skin lesion or trauma - Systemic antibiotics, local compresses, analgesics Cellulitis on the lower leg, characterized by redness, nodules, and swelling . Staphylococcal Skin Infections (Cont (. Impetigo (Pyoderma ( - Superficial skin infections limited to epidermis - Common in infants and children - People who play contact sports are susceptible - Treatment depends on age of child and severity of infections Includes hygienic measures, topical treatment, oral antibiotics Streptococcal Skin Infections Most often streptococcal skin infections are secondary to a primary lesion caused by another organism .

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