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

Group

IA04

XP12H1

XP31H1

XP69H3

before

necropsy

before

necropsy

before

necropsy

before

necropsy

NV

< 10

< 10

< 10

< 10

< 10

< 10

15

12

HE

14^a

33^b

307

240

229

82

494

344

HO

297

360

38

57

< 10

< 10

< 10

21