A non-lactose-fermenting gram negative rod swarms across the blood agar plate and is strongly and rapidly urease positive. Which organism is most likely?
1Pseudomonas aeruginosa
2Proteus mirabilis✓ 정답
3Serratia marcescens
4Salmonella species
해설
Swarming motility across the agar surface together with a rapidly positive urease reaction is characteristic of Proteus. It is a common urinary pathogen, and urease-driven hydrolysis of urea alkalinizes the urine and predisposes to stone formation.