1 MCQs in Microbiology for NEET PG
A 52-year-old woman with a history of recurrent urinary tract infections presents with acute pyelonephritis. Urine culture grows a gram-negative rod that is positive for extended-spectrum β-lactamase (ESBL) production. The organism is motile, ferments lactose, produces gas from glucose, and is positive for the methyl red test. On MacConkey agar, it forms mucoid colonies. Which of the following organisms is MOST likely, and what is the PRIMARY mechanism of resistance to third-generation cephalosporins in this isolate?
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