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ID50 of a laboratory-grown V. cholerae O1 strain in the presence and absence of a lytic phage, JSF4. Groups of five mice were infected with strain C6706 together with a lytic phage, JSF4, and without phage. The doses used are shown on the x axis, and the percentage of mice infected after 24 h is shown on the y axis. The ID50 for each group was determined graphically and is indicated by the vertical broken lines.
