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[Spontaneous phage production in Pseudomonas pseudomallei and in a range of hosts of melioidosis phages among representatives in the genus Pseudomonas].

A capacity to spontaneous phage production has been studied in 57 melioidosis museum strains. The strains were comparatively analyzed by the levels of frequencies of spontaneous phage production. It is established that 40 of 57 studied strains of Pseudomonas pseudomallei are capable to spontaneously produce phages with frequency from 10(7) to 1. On the indicator lawn of P. mallei phages formed negative colonies of different morphology transparent, turbid and turbid with secondary growth in the centre. No distinct correlation between the frequency of spontaneous phage production and morphology of negative colonies was revealed. The range of hosts of melioidosis phages was determined among 88 representatives of Pseudomonas genus. All melioidosis strains were resistant to their own phages. Phages, identical by the spectrum of lithic effect, were not found even in the case of quantitative coincidence of sensitive strains. Maximum activity was observed in 8 lysates which were lysed 42 to 53 strains of 88 under study.