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Table 2 HI titers (reciprocal geometric means) against 4 influenza strains (challenge strain IA04 (β) and the commercial vaccine isolates: XP12H1(γ), XP31H1(δ) and the XP69H3) by group of treatment

From: Vaccination of influenza a virus decreases transmission rates in pigs

HI titers
Group IA04 XP12H1 XP31H1 XP69H3
  before necropsy before necropsy before necropsy before necropsy
NV < 10 < 10 < 10 < 10 < 10 < 10 15 12
HE 14a 33b 307 240 229 82 494 344
HO 297 360 38 57 < 10 < 10 < 10 21
  1. Before contact (- 2 dpc) and at necropsy (i.e. + 7 dpc for the control group/+14 dpc for the vaccinated groups).
  2. a,b Statistically significant differences (p < 0.05).