An alpha-hemolytic, catalase-negative, gram-positive diplococcus was isolated from the expectorated sputum of a 79-year-old female admitted with pneumonia
The umbilicated colony was tested against optochin and provided a zone of inhibition equal to 18 mm. The organism was screened for penicillin resistance. The oxacillin disk diffusion result equaled 16 mm. The organism should
A) be reported as a penicillin-resistant Streptococcus pneumoniae.
B) not be reported because it is a viridans Streptococcus.
C) be reported as a penicillin-susceptible Streptococcus pneumoniae.
D) be retested against penicillin using an MIC method.
D
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