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Faculté de Pharmacie, Université de Bourgogne, Dijon, France.
It is necessary to isolate new phages in order to improve the rate of typeability of Listeria monocytogenes strains. We propose a method which increases the detection of induced phages in the presence of inhibitory substances synthesized or liberated by the cells during phage production. Of the 29 phages isolated, 11 (38%) were detected by the spot-on-the-lawn technique and 18 (62%) were revealed by the soft-agar technique. To increase the rate of phage detection, both techniques appear useful. Listeria cultures were subjected to phage typing procedures utilizing these newly isolated phages and the French International set of phages. It appears that the newly isolated phages are good tools for the differentiation of Listeria strains. Among them, one phage seems to be complementary to the French International set.
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