an epidemiological study of listeriosis in dairy cattle

same pattern, pattern 1, while 2 isolates from water (visits 5 and 10) had different
patterns, patterns 8 and 9 respectively (Figure 6. 11).
On farm D, 2 different patterns were obtained from the repeat isolates from
silage (visits 2, 4 and 8), pattern 5 in silage collected at visits 2 and 8 and pattern 6 in
silage collected at visit 4. Repeat isolates from the same animal (animal 12) on 2
different visits, 2 visits apart (visits 5 and 7), had two different patterns, patterns 5 and
11 respectively. (Figure 12a and 12b).
On the farm E, 2 different patterns were detected in repeat isolates from water,
pattern 6 in the isolate from water collected at visit 4 and pattern 1 in isolates from
water collected at visits 5 and 7. The pattern 6 was detected in bedding collected at
visits 4 and 6 and pattern 7 in bedding collected at visit 7.
L. monocytogenes was isolated from milk on 3 farms (A, B and D). Three
different patterns were obtained from the milk samples, pattern 4 was in milk samples
collected from farm A, pattern 1 in milk from farm B. On farm D the same pattern
(pattern 5) was detected in all of the isolates from milk samples examined. This pattern
was also detected in 2 of the 5 environmental samples and only 3 of the 22 faecal
samples.
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