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contentuptodate· Content· item f33_33_34334
©2013 UpToDate ® Print Email Optochin disk test 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.