Enter your email to get your 85% OFF code and unlock the full USMLE question bank on the app.
Free notes, MCQs, tables & flowcharts for USMLE Step 3 Microbiology
A 60-year-old man presents with fever and cough productive of rust-colored sputum and is diagnosed with community acquired pneumonia. The causative organism is isolated, and a Gram stain is shown in Figure 1. Which of the following most correctly describes additional features of the most likely causative organism?
ACatalase negative, alpha hemolytic, optochin sensitive
BCatalase positive, alpha hemolytic, optochin sensitive
CCatalase negative, alpha hemolytic, optochin resistant
DCatalase positive, beta hemolytic, optochin sensitive
ECatalase negative, beta hemolytic, optochin sensitive
A 24-year-old man presents with a painless genital ulcer for the past 2 weeks. He reports that he recently has been having unprotected sex with multiple partners. Past medical history is unremarkable. On physical examination, a single ulcer is present on the dorsal shaft of the penis which is circumscribed, indurated, and partially healed. There is moderate inguinal lymphadenopathy but no buboes. Which of the following tests would confirm the most likely diagnosis in this patient?
APerform a darkfield microscopic examination of a swab from the chancre
BSwab the chancre and perform a saline wet mount
CFluorescent treponemal antibody absorption (FTA-ABS) test
DFrei test
EVenereal Disease Research Laboratory (VDRL) test
A 23-year-old G1P0 female presents to her OB/GYN for her routine 36-week visit. Her current complaints include increased fatigue at the end of the day, and edema in her ankles. The patient’s physical examination is unremarkable except for inguinal adenopathy. Upon pelvic examination for cervical changes, the OB/GYN notices a vaginal chancre. The patient states that it is not painful when touched. Which of the following is the most likely diagnosis?
ASecondary syphilis
BCardiovascular syphilis
CPrimary syphilis
DGummatous syphilis
ENeurosyphilis
+ 7 more in the PDF
Browse all chapters