38 MCQs in Microbiology for NEET PG
A Gram stain of a sputum sample shows pink, rod-shaped bacteria. Which of the following best explains the pink color of these organisms?
A 32-year-old woman from Delhi presents to the emergency department with acute onset fever (39.2°C), severe headache, neck stiffness, and photophobia for 6 hours. On examination, Kernig's sign is positive. A lumbar puncture is performed and cerebrospinal fluid (CSF) is sent for Gram stain and culture. The Gram stain shows gram-negative diplococci with a kidney bean or coffee bean morphology. What is the most likely organism?
A 32-year-old woman presents with acute purulent meningitis. Cerebrospinal fluid (CSF) analysis shows gram-negative diplococci. Blood culture is pending. What is the drug of choice for empiric treatment of this patient?
The Gram stain image shown above displays multiple bacterial morphologies and staining characteristics. Identify the organisms indicated by arrows A, B, and C, respectively.
Regarding the Gram stain procedure and its interpretation, all of the following statements are correct EXCEPT:
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