Vibrio O129 Differential Disc (150 mcg) is used for differentiation of Vibrio species based on sensitivity to Vibriostatic agent O129. Even among the genus Vibrio , different species show different sensitivities to 0129(3); hence two different concentration discs are to be simultaneously tested to determine the degree of sensitivity of the species. 0129 discs of two concentrations are available: 10-μg and 150-μg. Vibrio parahaemolyticus ATCC 17802 :Partially sensitive Aeromonas hydrophila ATCC 7966 :Resistant