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Bullous impetigo
| • | pure staph infection; local toxins (exfoliatin) |
| • | particular strain = phage group 2 type 71 (same as in staph scalded skin) |
| • | split in granular layer; may not see intact blister clinically (in either form of impetigo) |
| • | culture and gram stain of blister usually negative (because toxin mediated) |
| • | major complication = staph scalded skin syndrome |
Impetigo contagiosum
| • | staph and/or strep infection; can lead to post-streptococcal glomerulonephritis (but not rheumatic fever) |
| • | subcorneal blister (i.e. very superficial) |
| • | on gram stain: to be called “pathologic”, the organisms must be seen in PMN’s |
| • | major complication (with strep) = post-streptocoocal glomerulonephritis (remember that Rh fever is only from strep pharyngitis mnemonic - the only way to a man's heart is through his throat but PSGN can be from either) |
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