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Rim Halaby (talk | contribs) Created page with "{{WBRQuestion |QuestionAuthor={{Rim}} |ExamType=USMLE Step 1 |MainCategory=Microbiology |SubCategory=Genitourinary |MainCategory=Microbiology |SubCategory=Genitourinary |MainC..." |
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{{WBRQuestion | {{WBRQuestion | ||
|QuestionAuthor={{Rim}} | |QuestionAuthor={{Rim}} {{Alison}} | ||
|ExamType=USMLE Step 1 | |ExamType=USMLE Step 1 | ||
|MainCategory=Microbiology | |MainCategory=Microbiology | ||
| Line 20: | Line 20: | ||
|MainCategory=Microbiology | |MainCategory=Microbiology | ||
|SubCategory=Genitourinary | |SubCategory=Genitourinary | ||
|Prompt=A 38 year old | |Prompt=A 38-year-old male presents to the ER with complaints of fever and back pain, radiating to the inguinal area. Vital signs reveal a temperature of 38.5 °C, heart rate of 98 beats per minute, and blood pressure measuring 122/88 mmHg. Following appropriate work-up, you diagnose him with struvite stone and preform a stone and urine culture. The cultures reveal a urea-splitting organism with swarming motility. Which of the following characteristics most likely corresponds to this organism? | ||
|Explanation=Proteus mirabilis | |Explanation=''Proteus mirabilis'', a causative agent of struvite stones, is an oxidase-negative, catalase-positive, urease-positive organism, which has a characteristic “swarming” motility in cultures. ''Proteus mirabilis'' is a known pathogen of the urogenital tract. Other examples of urea-splitting organisms are ''Pseudomonas'', ''Klebsiella'', ''Staphylococcus'', and ''Mycoplasma''. | ||
|EducationalObjectives= | |||
Proteus mirabilis is a common causative agent of struvite stones. It is an oxidase-negative, catalase-positive, urease-positive organism with characteristic “swarming” motility. | |''Proteus mirabilis'' is a common causative agent of struvite stones. It is an oxidase-negative, catalase-positive, urease-positive organism with characteristic “swarming” motility. | ||
|AnswerA=Oxidase-positive, catalase-positive, urease-positive | |AnswerA=Oxidase-positive, catalase-positive, urease-positive | ||
|AnswerAExp=Proteus is not oxidase-positive. | |AnswerAExp=''Proteus mirabilis'' is not oxidase-positive. | ||
|AnswerB=Oxidase-negative, catalase-negative, urease-positive | |AnswerB=Oxidase-negative, catalase-negative, urease-positive | ||
|AnswerBExp=Proteus is not catalase-positive | |AnswerBExp=''Proteus mirabilis'' is not catalase-positive. | ||
|AnswerC=Oxidase-positive, catalase-negative, urease-negative | |AnswerC=Oxidase-positive, catalase-negative, urease-negative | ||
|AnswerCExp=Proteus is | |AnswerCExp=''Proteus mirabilis'' is not oxidase-positive, catalase-negative, nor urease-negative. | ||
|AnswerD=Oxidase-negative, catalase-positive, urease-positive | |AnswerD=Oxidase-negative, catalase-positive, urease-positive | ||
|AnswerDExp=Proteus mirabilis is correctly an oxidase-negative, catalase-positive, urease-positive organism | |AnswerDExp=''Proteus mirabilis'' is correctly an oxidase-negative, catalase-positive, urease-positive organism. | ||
|AnswerE=Oxidase-positive, catalase-positive, urease-negative | |AnswerE=Oxidase-positive, catalase-positive, urease-negative | ||
|AnswerEExp=Proteus is not oxidase positive | |AnswerEExp=''Proteus mirabilis'' is not oxidase positive nor urease-negative. | ||
|RightAnswer=D | |RightAnswer=D | ||
|Approved= | |Approved=Yes | ||
}} | }} | ||
Revision as of 18:37, 16 July 2014
| Author | [[PageAuthor::Rim Halaby, M.D. [1] (Reviewed by Alison Leibowitz)]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Microbiology |
| Sub Category | SubCategory::Genitourinary |
| Prompt | [[Prompt::A 38-year-old male presents to the ER with complaints of fever and back pain, radiating to the inguinal area. Vital signs reveal a temperature of 38.5 °C, heart rate of 98 beats per minute, and blood pressure measuring 122/88 mmHg. Following appropriate work-up, you diagnose him with struvite stone and preform a stone and urine culture. The cultures reveal a urea-splitting organism with swarming motility. Which of the following characteristics most likely corresponds to this organism?]] |
| Answer A | AnswerA::Oxidase-positive, catalase-positive, urease-positive |
| Answer A Explanation | AnswerAExp::''Proteus mirabilis'' is not oxidase-positive. |
| Answer B | AnswerB::Oxidase-negative, catalase-negative, urease-positive |
| Answer B Explanation | AnswerBExp::''Proteus mirabilis'' is not catalase-positive. |
| Answer C | AnswerC::Oxidase-positive, catalase-negative, urease-negative |
| Answer C Explanation | AnswerCExp::''Proteus mirabilis'' is not oxidase-positive, catalase-negative, nor urease-negative. |
| Answer D | AnswerD::Oxidase-negative, catalase-positive, urease-positive |
| Answer D Explanation | AnswerDExp::''Proteus mirabilis'' is correctly an oxidase-negative, catalase-positive, urease-positive organism. |
| Answer E | AnswerE::Oxidase-positive, catalase-positive, urease-negative |
| Answer E Explanation | AnswerEExp::''Proteus mirabilis'' is not oxidase positive nor urease-negative. |
| Right Answer | RightAnswer::D |
| Explanation | [[Explanation::Proteus mirabilis, a causative agent of struvite stones, is an oxidase-negative, catalase-positive, urease-positive organism, which has a characteristic “swarming” motility in cultures. Proteus mirabilis is a known pathogen of the urogenital tract. Other examples of urea-splitting organisms are Pseudomonas, Klebsiella, Staphylococcus, and Mycoplasma. Educational Objective: |
| Approved | Approved::Yes |
| Keyword | |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |