Chapter 3 - Microbiology

  1. Pt has a redish, brown slightly scaly patch with sharp borders. You suspect a gram a skin infection known as erythrasma but arn't sure if it is. What test might you perform to confirm diagnosis besides biopsy?
    Hint: you might need a lamp.
    What is the infecting organism?
    Under Wood's lamp you would see coral-red florescence if it was erythrasma caused by CORYEBACTERIUM MINUTISSIMUM
  2. Patient was bite by a cat, what is the most likely infected organism?
    Pasteurella (gram - rod)
  3. 9 yo boy presents with pain in multiple large joints, he has a macular rash on his trunk and arms, and a fever. Pt was diagnosed with rheumatic fever. What is the infecting organism?
    Strept pyogenes
  4. Xrays reveal gas in tissues, name major organism involved? and one more organism that is gas producing?
    • Clostridium perfringes
    • Bacteroides melaninogenicus Fusobacterium
  5. Name 1 gram negative cocci and 1 gram negative rod?
    • Gram - cocci: Neiseria gonorrheae
    • Gram - rod: Pseudomonas
  6. Patient recently was burned and now has infection. What organism is most likely present?
    Pseudomonas aerginosa is common in post burn infection
  7. Name 2 gram + rods that are nonsporeforming and 2 that are sporforming?
    • Nonsporeforming:
    • 1. Corneybacterium diphtheriae
    • 2. Mycobacterium tuberculosis

    • Sporeforming:
    • 1. Bacillus
    • 2. Clostridium
  8. Patient has a superficial brwonish red scaling area on trunk. The lesion fluoresces under UV light. What is your diagnosis? Can this infection become systemic?
    Tinea versicolor - superficial mycosis

    Superficial mycosis are found on the outer layer of stratum corneum or on the hair. These fungi do not elicit an immune response and do not become systemic.
  9. Pt presents with swollen lesions on feet, draining sinuses and "grains" of colonies draining from sinuses. Can this infection become systemic? How is this infection usually through what method?
    Madura foot (Eumycotic mycetoma), this is a subcutaneous mycosis infection and is usually by way of a thron producing a localized absess and granulomata.
  10. Pt presents with cough, fever and malaise. Name the different systemic mycosis disease based on description
    1. The patient is dark skinned
    2. Pt has been playing in bird and bat manure in Mississippi
    3. Pt was rolling in soil and pigeon manure.
    • 1. Coccidioidomycosis
    • 2. Histoplasmosis
    • 3. Cryptococcosis

    *Most systemic mycosis begin in lungs by inhalation of spores.
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Chapter 3 - Microbiology
Pocket podiatrics chapter 3