FIG. 1.

Southern blot analysis of isolated Ent plasmids from clinical ETEC strains. Lanes contained HindIII-digested plasmid DNAs from the following isolates hybridized with LT probe DNA: 1, K1; 2, K2; 3, K3; 4, K4; 5, K5; 6, S1; 7, S2; 8, S6; 9, 102. Differentiation into types a, a*, b, c, and d is indicated for restriction site polymorphism of the upstream eltAB region (a* indicates a plasmid harboring two eltAB copies). Numbers on the left indicate fragment size (in kilobase pairs).