Optochin disk test to differentiate alpha-hemolytic (green) streptococci. Streptococcus pneumoniae is susceptible to optochin as shown by the zone of inhibition around the disk of the culture on the right. Other alpha-hemolytic streptococci (example on left) are resistant to this compound.
Courtesy of Harriet Provine.
Graphic 59890 Version 3.0
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