USMLE (Fach) / Microbiology (Lektion)

Vorderseite Pseudomonas aeruginosa
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Gram ⊝, aerobic, motile. Non-lactose fermenter. Oxidase ⊕.- Grows in water and humid conditions, eg, hot tub, contaminated lens solution.- Has grape-like odor.

- Produces pyoverdin and pyocyanin (blue-green pigment; generates ROS)- Produces exotoxin A (inactivates EF-2)- Produces phospholipase C (degrades cell membranes)- Elastase (degrades elastin – important for blood vessel destruction)

- Mucoid polysaccharide capsule may contribute to chronic pneumonia in cystic fibrosis patients due to biofilm formation.- Wound infection in burn victims- Frequently found in water → hot tub folliculitis- Corneal ulcers/keratitis in contact lens wearers/minor eye trauma- Associated with pneumonia, sepsis, UTIs, diabetes, osteomyelitis, otitis externa (swimmer's ear), nosocomial infections (eg, catheters, equipment), addicts (drug abusers)

- Ecthyma gangrenosum – rapidly progressive, necrotic cutaneous lesion. Typically in immunocompromised patients.

Treatments: Carbapenems, aminoglycosides, monobactams, polymyxins (eg, polymyxin B, colistin), fluoroquinolones (eg, ciprofloxacin, levofloxacin), 3rd and 4th generation cephalosporins (eg, ceftazidime, cefepime), extended-spectrum penicillins (eg, piperacillin, ticarcillin)

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