Fig. 1

Schematic representation of the variable regions identified in bovine milk associated isolates. Cassette types (a-k) are arranged as identified in Table 2. Gene cassettes are shown as boxes, with arrows for the orientation of transcription and black circles for the 59-base elements. Hatched rectangles designate 5′- and 3′- conserved segments (CSs). The 5’CS and 3’CS amplification primers are indicated by arrowheads