Is any zone size obtained with the Taxo P Disc indicative of S. pneumoniae?
No. Zones of inhibition of 14 mm or more are formed with pure cultures of S. pneumoniae. Other organisms may show zone sizes less than 14 mm in diameter. A diameter between 6 and 14 mm is questionable for pneumococci and the strain should be presumptively identified as a pneumococcus only if it is bile soluble.
