Himedia Diphtheria Virulence Agar Base

Diphtheria Virulence Agar Base

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Diphtheria Virulence Agar Base is recommended for determining toxigenicity of Corynebacterium diphtheriae. C. diphtheriae is demonstrated by the formation of a white line of precipitate where it meets with diphtheria antitoxin diffusingfrom a strip of filter paper embedded in the agar. Potassium tellurite inhibits most gram-negative bacteria except Corynebacterium species, Streptococcus mitis, Streptococcus salivarius and Enterococci. Staphylococcus epidermidis may exhibit growth. False positive results may also be encountered. Therefore, a positive control has to always be run in parallel. Corynebacterium ulcerans and Corynebacterium pseudotuberculosis may also produce line of precipitation.