An alpha-hemolytic, catalase-negative gram-positive diplococcus is optochin susceptible and bile soluble. Which organism is most likely?
1Enterococcus faecium
2Staphylococcus aureus
3Streptococcus pneumoniae✓ 정답
4Listeria monocytogenes
해설
Optochin susceptibility and bile solubility are classic phenotypic findings supporting identification of S. pneumoniae among alpha-hemolytic streptococci.