FIG. 2.

PFGE of SmaI-digested genomic DNAs from VREF. Lanes: 1, lambda phage DNA ladder standard; 2, M1, most common strain type (36% of isolates) from CHAR 1; 3, M2 (3% of isolates) from CHAR 1; 4, M3 (18% of isolates) from CHARs 1, 4, and 11; 5, M4 (6% of isolates) from CHAR 1; 6, M10 (4% of isolates) from CHAR 1; 7, M11 (3% of isolates) from CHARs 1 and 4; 8, M20, from CHAR 8; 9, M22, from CHARs 1 and 8; 10, M23, from CHARs 1, 2, and 8; 11, M24 from CHAR 4; 12, M27 from CHAR 4; 13, M66 from CHAR 9; 14, M67 from CHAR 5; 15, M69 from CHAR 11; 4, 7, 9, and 10, strain types found in more than one CHAR; 1 to 6, 9, 10, and 12, strain types involved in interhospital dissemination; 8 and 11, strain types involved in intrahospital dissemination only; 13 to 15, unique strain types not involved in any dissemination.