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

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Old 07-28-2009
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Bacteria Major encapsulated organisms

Some Killers Have Pretty Nice Capsules
  • Step pneumonia
  • klebsiella
  • Heamophilus influenzae
  • Pseudomonas aeruginosa
  • Neisseria meningitidis
  • Cryptococcus neoformans
This mnemonic is seen everywhere including Kaplan and FA
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Old 03-07-2019
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Default New Mnemonic!

YES Some Nasty Killers Have Pretty Big Capsule

Yersinia pestis
E.Coli ( meningeal strains only)
Salmonella typhi

Streptococcus Pneumoniae and Beta Hemolytic Group

Neisseria Meningitidis

Klebsiella Pneumoniae

H.influenzae type b

Pseudomona aeruginosa

Bacillus anthracis

Cryptococcus neoformans

Side Note #1:

For some reason FA and kaplan neglects to mention Staphylococcus Aureus, which has 11 serotypes/strains that have capsule and there should be a correction in that it is not group B streptococci, both beta hemolytic groups A and B produce capsule. Also Campylobacter jejuni has 47 capsular strains. Some other bacteria are partially encapsulated or unfinished or what is called microcapsules that functions and not completely understood. This is the case with Citrobacter (there is development of vaccines against Salmonella due to similar composition of vi polysacharide capsule )and Bordetella pertussis. Also vibrio cholera does have 1 strain (139) that is encapsulated.
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