|
Period
|
Type of vaccine
|
Response
|
Response rate (no.) in horses with pre-vaccination VN titer of:
|
|---|
|
< 10
|
10
|
20
|
40
|
80
|
160
|
320
|
640
|
Total no.
|
|---|
|
2013–2014
|
Inactivated
|
Significant increasea
|
1
|
7
|
7
|
5
|
1
|
0
|
0
|
0
|
21
|
|
No increase
|
0
|
1
|
4
|
5
|
9
|
7
|
3
|
0
|
29
|
|
Total no.
|
1
|
8
|
11
|
10
|
10
|
7
|
3
|
0
|
50
|
|
2014–2015
|
Live
|
Significant increase
|
2
|
12
|
13
|
10
|
5
|
2
|
1
|
0
|
45
|
|
No increase
|
0
|
0
|
0
|
0
|
1
|
3
|
1
|
0
|
5
|
|
Total no.
|
2
|
12
|
13
|
10
|
6
|
5
|
2
|
0
|
50
|
|
2015–2016
|
Live
|
Significant increase
|
7
|
6
|
11
|
6
|
6
|
1
|
1
|
0
|
38
|
|
No increase
|
0
|
0
|
0
|
0
|
3
|
3
|
4
|
2
|
12
|
|
Total no.
|
7
|
6
|
11
|
6
|
9
|
4
|
5
|
2
|
50
|
- aA more than four-fold titer rise was regarded as a significant increase
