Acute onset pneumonia: Laboratory Identification

Ungraded Practice Question

The patient was admitted to the hospital. The sputum specimen was inoculated to sheep blood agar. Based on the colony morphology and the alpha hemolysis seen in the accompanying photograph, the most likely identification is:

Please select the single best answer

Streptococcus pneumoniae
viridans streptococcus
Streptococcus pyogenes
Streptococcus agalactiae

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