A Gram stain of purulent wound exudate shows gram-positive cocci arranged in grape-like clusters. Which organism is most likely?
1Streptococcus pyogenes
2Neisseria gonorrhoeae
3Staphylococcus aureus✓ 정답
4Escherichia coli
해설
Gram-positive cocci in clusters are typical of Staphylococcus; S. aureus is the leading wound pathogen. Streptococci form chains, Neisseria are gram-negative diplococci, E. coli is a gram-negative rod.