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7. Skin and Wounds - Skin Infections Infections of Skin...

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Infections of Skin & Wounds Skin Infections Two key bacterial genera associated with skin infections: A) Staphylococcus B) Streptococcus Why? Because they are two well adapted Gram positives found on your skin! Bacteria (Facultative anaerobes) pos. neg. Gram stain: cocci bacilli Morphology: Micrococcaceae Streptococcaceae Family: Genus: STAPHYLOCOCCUS Micrococcus Planococcus Stomatococcus Species: S. aureus CNST (13 human species) (coagulase pos.) (coagulase neg.) Bacteria (Facultative anaerobes) Gram stain: pos. neg. Morphology: cocci bacilli Family: Micrococcaceae Streptococcaceae Genus: STREPTOCOCCUS Pediococcus Leuconostoc Others Group: Streptococcus Enterococcus Lactococcus Species: pyogenic Strep. viridans Strep. S. pneumoniae A. Staphylococcus Epidemiology: i) Staphylococcus aureus • nasal carriage in 20 - 40% of adults • vaginal carriage in 10% of women • skin (axilla, perineum) in 5 - 25% ii) C oagulase N egative St aphylococcus (CNST) • normal inhabitants of skin, anterior nares and genitourinary tract B. Streptococcus Epidemiology: i) Streptococcus pyogenes (“Group A Strep”) • found in nose, pharynx and occasionally perineum • 5 - 15% of people are carriers • carriage rates vary with age, season
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Skin Infections Clinical Syndromes: 1) Local, pyogenic infections • skin - impetigo, erysipelas, cellulitis • hair follicle - folliculitis, furuncle, carbuncle 2) Secondary to (related to) bloodstream dissemination 3) Secondary to localized infection with associated skin rash (toxin-mediated) Skin Infections 1) Local, pyogenic (pus forming +/- abcesses) infections: Favored by - poor personal hygiene
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