A 25-year-old woman has a vaginal discharge with a fishy odor, and clue cells are seen on microscopy. What is the best treatment?
Answer and explanation
Correct answer: B. Metronidazole
- Step 1: A fishy discharge with clue cells is bacterial vaginosis. Step 2. The discharge has a pH above 4.5 and a positive whiff test. Answer: metronidazole. Why not the others: fluconazole treats candida, ceftriaxone treats gonorrhea and acyclovir treats herpes.
Practise more Microbiology and Infectious Disease.
Free questions with an explanation for every one, and full timed USMLE Step 1 mock tests.
More Microbiology and Infectious Disease questions
- A newborn has conjunctivitis 3 days after delivery. The Gram stain shows gram-negative intracellular diplococci. Which organism is responsib…
- Which organism is the most common cause of community-acquired pneumonia in adults?
- A 22-year-old man has a sore throat, fever, posterior cervical lymphadenopathy and splenomegaly. Atypical lymphocytes are seen on the smear.…
- A farmer has a painless black eschar on the arm with surrounding edema. The Gram stain of the lesion shows large gram-positive rods. Which o…
- A 25-year-old woman has dysuria and frequency. Urine culture grows a lactose-fermenting gram-negative rod that forms pink colonies on MacCon…
- A man with a urinary catheter develops a urinary infection with alkaline urine and struvite stones. Which organism produces urease and cause…