[The use of growth stimulants in the bacteriologic diagnosis of Yersinia].

The effects of K. S. Karpuzidi's stimulants (0.5-1 percent) and of para-amino benzoic acid (0.1-05 mM) on the growth and multiplication of 3 Yersinia pseudotuberculosis, 1 Y. enterocolitica strains, and E. coli nonpathogenic strain were examined. Karpuzidi's stimulant was found to selectively stimulate Yersinia cell growth and inhibit Escherichia development in conditions unfavorable for these bacteria. Para-amino benzoic acid intensively stimulated the growth of both Yersinia and Escherichia. When Karpuzidi's stimulant was added to the accumulation medium after frosting-defrosting, it increased Yersinia harvest in cultures isolated from humans 2-3.5 times and that in cultures from the environmental objects 6-7 times. The results of bacteriologic investigation may be obtained 3-5 days sooner.