[Development of a method for assessing viable Bifidobacterium in the preparation Bifikol].

The method has been developed for accounting viable bifidobacteria in the complex preparation biphicol using the growth inhibitor of Escherichia coli (0.01% solution of sodium azide), added to the growing medium. Choice of sodium azide concentration inhibiting growth of Escherichia coli M-17 and not affecting the growth of Bifidobacterium bifidum 1 is described in detail.

[Antibiotic sensitivity of an Escherichia coli strain used for preparing colibacterin].

Sensitivity of a E. coli strain and commercial colibacterins prepared with its use to 18 antibiotics was tested. The MIC was determined by the method of serial dilutions.

[Antibiotic sensitivity of bifidobacteria and lactobacteria used in the preparation of bifidobacterin and lactobacterin].

Sensitivity of industrial strains and market preparations, such as bifidumbacterin and lactobacterin was studied with respect to 19 antibiotics. The MIC was determined with the method of serial dilutions. It was shown that bifidumbacteria and lactobacteria were either highly sensitive or markedly resistant to the antibiotics.