Herd-level risk factors associated with the presence of Phage type 21/28 E. coli O157 on Scottish cattle farms

BMC Microbiology

Table 1 Phage types and vtx gene possession of the 509 E. coli O157 isolates from the 88 E. coli O157 positive study farms.

Phage Type	Number of vtx1 Positive Isolates	Number of vtx2 Positive Isolates	Total Number of Isolates		% of Characterized Isolates
21/28	0	257	257	(50)	50.5
32	0	85	85	(26)	16.7
8	48	47	51	(9)	10.0
2	0	50	50	(8)	9.9
34	0	22	22	(1)	4.3
33	0	7	7	(1)	1.4
4	0	6	6	(3)	1.2
31	0	2	5	(2)	1.0
49	0	2	2	(2)	0.4
54	0	2	2	(1)	0.4
14	0	1	1	(1)	0.2
RDNC*	1	18	18	(4)	3.5
Untypable	0	0	3	(2)	0.6
Total Isolates	49	499	509

Figures in brackets indicate the number of farms on which the isolates of each phage type were found. * Phages Reacted but Did Not Conform to any known pattern

ISSN: 1471-2180