Table 1 Duration of detection of Dichelobacter nodosus and Fusobacterium necrophorum on feet by disease status, 17 sheep observed for 20 weeks (Study 2).

From: Sites of persistence of Fusobacterium necrophorum and Dichelobacter nodosus: a paradigm shift in understanding the epidemiology of footrot in sheep

Type of detectiona

Disease statusb

No. episodes

No. feet

n = 68

No. sheep

n = 17

Durationc

median (range)

D. nodosus

Persistent (N = 22)

H/H

4

4

3

2 (2–2)

H/D

9

7

3

5 (3–10)

D

9

9

7

4 (2–18)

Transient (N = 62)

H/H

45

35

17

1

H/D

10

8

7

1

D

7

7

6

1

No detection (NA)

Never diseased

NA

8

4

0

Ever diseased

NA

12

9

0

F. necrophorum

Persistent (N = 12)

H/H

2

2

2

2 (2–2)

H/D

4

4

3

2 (2-3)

D

6

6

5

3 (2–13)

Transient (N = 38)

H/H

30

26

12

1

H/D

7

7

5

1

D

1

1

1

1

No detection

Never diseased

NA

10

7

0

Ever diseased

NA

21

12

0

  1. aPersistent = Bacterium detected >1 consecutive week; Transient = Bacterium detected <2> 0 consecutive weeks; No detection = never detected during study; N = total number of episodes.
  2. bH/H = healthy foot, all 4 feet of sheep healthy; H/D = healthy foot, at least one other foot of the same sheep diseased; D = diseased foot; Never diseased = foot never had footrot during study; Ever diseased = foot had footrot on at least one occasion during study.
  3. cDuration = number of weeks with positive samples.
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