WBR0301
| Author | [[PageAuthor::Rim Halaby, M.D. [1]]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Microbiology |
| Sub Category | SubCategory::Infectious Disease |
| Prompt | [[Prompt::A lab technician is conducting a test to speciate a gram positive organism he obtained from an operating room wound swab. After isolating the organism, he inoculates it perpendicularly to streaks of a beta-hemolytic staphylococcus on sheep blood agar plates and incubates them at 37 C for 2 days. While examining the plates, he notices the pattern seen below. Which of the following is the most likely isolated organism?
|
| Answer A | AnswerA::Streptococcus agalactiae |
| Answer A Explanation | AnswerAExp:: |
| Answer B | AnswerB::Streptococcus viridans |
| Answer B Explanation | AnswerBExp:: |
| Answer C | AnswerC::Streptococcus pyogenes |
| Answer C Explanation | AnswerCExp:: |
| Answer D | AnswerD::Staphylococcus epidermidis |
| Answer D Explanation | AnswerDExp:: |
| Answer E | AnswerE::Listeria monocytogenes |
| Answer E Explanation | AnswerEExp:: |
| Right Answer | RightAnswer::A |
| Explanation | [[Explanation::Reference: Darling CL. Standardization and evaluation of the CAMP reaction for the prompt, presumptive identification of Streptococcus agalactiae (Lancefield group B) in clinical material. J Clin Microbiol. 1975;1(2):171-4. |
| Approved | Approved::No |
| Keyword | WBRKeyword::Streptococcus agalactiae, WBRKeyword::Group B streptococcus, WBRKeyword::CAMP test, WBRKeyword::Beta-Hemolysis |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |
