Research Institute of Epidemiology and Microbiology (Siberian Branch of the Russian Acad. Med. Sci.), Vladivostok, Russia
Under experimental conditions within the time limit of 21–35 days the causative agents of sapronotic infections in binary cultures, grown on a solid medium at 37°C, 25–27°C and 6–8°C, interacted with one another transbiotically and through contact, their interactions having the character of amensalism, commensalisms-amensalism, competitive equilibrium, antibiosis. Irrespective of the initial density, a change in the species composition was observed, one of them playing the dominating role. At 37°C mutual antagonism of Yersinia pseudotuberculosis and Pseudomonas aeruginosa killed both cultures. P.aeruginosa cells were also killed when cultivated at 37°C jointly with Listeria monocytogenes, the most resistant species under experimental conditions. While studying the character of microorganisms interactions the method of contacting cultures on a solid medium was shown to give more information in comparison with the “cross-strip” method. Possible interspecific relationships between the causative agents of sapronotic infections under natural conditions are discussed.
Zh. Mikrobiol. (Moscow), 2002, No. 1. P. 11—16