Figure 1.

Dendrogram of XbaI macrorestriction electrophoretic patterns of the 37 isolates of VTEC O157:H7 described in the study; the phage type, abattoir of isolation and verotoxin type of each isolate. RDNC = this culture reacts with the typing phages but does not conform to a recognised pattern. RDNC* = 2 strains with identical typing phage patterns, but without a given phage type name. RDNC** = 2 strains with identical typing phage patterns, but without a given phage type name.