standard zones of clearing for various antibiotics

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Zones of clearing for various antibiotics Antibiotic (and disc identifier) Inhibition zone diameter (mm) Resistan t Intermed iate Suscepti ble Bacitracin (B) 8 or less 9 - 12 13 or more Optochin Less than 14 14 and more Novobiocin (NV) 16 or less More than 16 SPECIFIC RESULTS FOR OPTOCHIN Inhibition zone (mm) Result >= 14 Streptococcus pneumoniae 0 Viridans streptococci other than S. pneumoniae < 14 S. pneumoniae is to be confirmed by the bile-solubility test

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Page 1: Standard Zones of Clearing for Various Antibiotics

Zones of clearing for various antibiotics

Antibiotic (and disc identifier)

Inhibition zone diameter (mm)

Resistant Intermediate Susceptible

Bacitracin (B) 8 or less 9 - 12 13 or more

Optochin Less than 14 14 and more

Novobiocin (NV) 16 or less More than 16

SPECIFIC RESULTS FOR OPTOCHIN

Inhibition zone (mm) Result

>= 14 Streptococcus pneumoniae

0 Viridans streptococci other than S. pneumoniae

< 14 S. pneumoniae is to be confirmed by the bile-solubility test