[Determination of the toxigenicity of Corynebacterium diphtheriae by using paper indicator disks].

The method for the determination of the toxigenicity of C. diphtheriae by means of discs impregnated with diphtheria antitoxin is proposed. The discs can be prepared long before use and stored for a year. The determination of toxigenicity with these discs is not inferior in its sensitivity to the routine procedure of the immunoprecipitation test. The disc method decreases the consumption of unavailable diphtheria antitoxin by 10 times, that of culture media by 2-2.5 times: besides, it is less labor consuming.