Cultures isolated from human and animal blood have been examined in tests with 3% KOH solution; their sensitivities to various concentrations of sulfanol have been tested in order to specify the tinctorial characteristics of these cultures; antibiotic sensitivity of this group of microorganisms has been studied with the use of discs. The findings evidence that gram-variable nonspore-carrying aerobic bacilli isolated from human and animal blood should be referred to gram-positive microorganisms; their antibiotic sensitivity has been detected. The tests employed in the study may be rationally used for the identification of polychromic bacteria isolated from the blood.

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