Premium 1-on-1 Tutoring for USMLE, CBSE/COMP, Shelf Exams, Clinical Rotations, Medical Coursework
A 51-year-old man with HIV is admitted to hospital for a 2-day history of rigors, chills, and high fever. Blood cultures grow Aspergillus. Intravenous caspofungin is initiated. Inhibition of which of …
HY USMLE Q #920 – Micro / Pharm See Full Post
It’s pass-level to know that Neisseria are gram-negative diplococci. Don’t confuse with Strep pneumo, which is gram-positive diplococci. Neisseria meningitidis The answer on USMLE for cause of meningitis in three groups: 1) …
Gram (-) diplococci + pleomorphic rods See Full Post
Serratia marcescens Cause of nosocomial UTIs; urease-positive; can lead to struvite (ammonium magnesium phosphate; staghorn) calculi, since these form at higher pH. Grows cherry red on culture medium. Catalase-positive. Serratia …
Gram (-) rods See Full Post
Bacillus cereus Causes vomiting and diarrhea following consumption of reheated rice / fried rice due to germination of spores. Can also cause eye infections post-surgery (e.g., for cataracts). What the …
Gram (+) rods See Full Post
You can see that catalase (+) vs (-) is how we differentiate the Staph vs Strep. Staph aureus Gram (+) cocci in clusters; catalase (+); coagulase (+). Grows yellow on culture medium …
Gram (+) cocci See Full Post
A 1-week-old neonatal male born at 39 weeks’ gestation is brought to the obstetrician for irritability and difficulty breastfeeding. He is febrile at 38 C. The mother consumed a diet …
HY USMLE Q #875 – Micro See Full Post
A 3-year-old boy is brought to the physician by his mother for a 1-day history of unusual facial erythema. Two days ago, he had a fever of 102 F. The …
HY USMLE Q #847 – Micro See Full Post
A 51-year-old woman comes to the physician for a 2-day history of worsening fever and photophobia. Her neck is stiff. Analysis of the CSF shows: Glucose …
HY USMLE Q #829 – Neuro / Micro See Full Post
A 25-year-old woman with HIV is brought to the ED by her brother for personality change over the past two weeks. She has had two episodes of Pneumocystis pneumonia during the …
HY USMLE Q #827 – HIV See Full Post
A 39-year-old woman comes to the physician for a 4-day history of a painful, tearing right eye. Vitals are within normal limits. Past medical history is unremarkable. A fluorescein instillation …
HY USMLE Q #821 – Micro See Full Post