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USMLE Step 1 Mnemonics Mnemonics, acronyms, reminders, and memorizing tips for the USMLE Step 1.

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Old 10-15-2009
Betro Sadek's Avatar
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Bacteria Catalase Positive Microorganisms

The classical USMLE question describing a case of Chronic Granulomatous Disease and then asking you what other infection is the patient liable to get.

Of course you should be thinking of all of the catalase positive microorganisms.

Here's a mnemonic

  • Staphylococci (important not confuse it with streptococci)
  • Pseudomonas aeroginosa
  • Aspergillus fumigatus
  • Candida
  • Enterobacteriaceae (specially Klebsiella and Serratia both of which can cause pneumonia and UTI)
Worth to remember that none of the anaerobes are Catalase positive

Also some others are Catalase positive
  • Nisseria (Gonorrhea & Meningitidis)
  • Vibrio
  • Nocardia
  • Campylobacter & Helicobacter
  • Gardnerella vaginalis
  • Pseudomonas cepacia
  • Mycobacterium Tebeculosis also produce a heat sensitive catalase ( active only in body temperature ) so it become catalase negative at 68.0 "F

Last edited by Sabio; 10-15-2009 at 07:00 PM.
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Old 08-12-2011
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Default Catalase positive organisms

Catalase positive organisms
Staphylococcus aureus
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Old 08-20-2011
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Default mnemonic for catalasve +ve organisms

Catalase +ve organisms- SPACE
Staph aureus
Candida Enterobacter
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Old 09-19-2011
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catalase positive
Staph aureus

CGD is SPACE +ve :-)
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Old 06-21-2012
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CGD is deficiency of NADPH oxidase. As a result the body is not able to protect itself against infections such as those caused by catalase+ organisms (staphylococci, pseudomonas, aspergillus, candida, enterobacters = SPACE)
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Old 08-21-2012
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Default dr.

hey guys thans for the mneomnics
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