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Table 2 Relationship between pre-existing VN titer against EHV-1 and its increase after vaccination

From: Epizootiological investigation of equine herpesvirus type 1 infection among Japanese racehorses before and after the replacement of an inactivated vaccine with a modified live vaccine

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
  1. aA more than four-fold titer rise was regarded as a significant increase