SUMMARY: After exposure to phage A1 an organism of an indicator strain of may burst with phage liberation, may become lysogenic, or may develop into a mixed progeny of lysogenic and phage-sensitive bacteria. By the methods we have used, the proportion of such mixed progenies is about 20% of the number of lysogenic colonies found. Evidence is given to show that members of the clone of phage A1 vary in virulence and that members of the indicator strain 1404 vary also in resistance to lysis. The establishment of lysogenesis depends on the interplay of these two factors when host and parasite meet.


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