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Table 1 The cross-reactivity of H1N1 viruses isolated from pigs, humans, and birds

From: Potency of a vaccine prepared from A/swine/Hokkaido/2/1981 (H1N1) against A/Narita/1/2009 (H1N1) pandemic influenza virus strain

  HI titer of chicken antisera against representative H1 viruses
Virusesa Narita/09 Sw/Iowa/15/30 Sw/Hok/81 PR/8/34 Hok/4/96 Dk/Mong/540/01
A/Narita/1/2009 5,120b 80 640 40 40 80
Swine isolates       
 A/swine/Iowa/15/1930 1,280 1,280 2,560 20 80 640
 A/swine/Niigata/1/1977 1,280 1,280 2,560 40 160 640
 A/swine/Shimane/1/1978 2,560 1,280 5,120 40 160 640
 A/swine/Shizuoka/1/1978 2,560 1,280 5,120 40 160 640
 A/swine/Toyama/1/1978 2,560 1,280 5,120 40 160 640
 A/swine/Kanagawa/1/1978 1,280 1,280 640 40 320 640
 A/swine/Hokkaido/2/1981 1,280 1,280 5,120 80 80 640
 A/swine/Miyagi/5/2003 (H1N2) 640 320 2,560 160 80 80
Human isolates       
 A/PR/8/1934 20 40 40 2,560 160 20
 A/Hokkaido/2/1996 320 80 80 160 5,120 320
 A/Hokkaido/11/2002 160 80 80 320 5,120 80
Avian isolates       
 A/duck/Miyagi/66/1977 160 80 80 40 40 640
 A/swan/Hokkaido/55/1996 320 80 40 80 80 1,280
 A/duck/Hokkaido/1130/2001 160 80 40 <20 <20 1,280
 A/duck/Hokkaido/1203/2001 160 80 80 <20 <20 640
A/duck/Mongolia/540/2001 80 160 40 <20 20 1,280
 A/duck/Hokkaido/83/2004 160 80 40 <20 <20 640
 A/duck/Hokkaido/W73/2007 80 80 80 <20 <20 640
  1. a: Subtype of viruses was H1N1 exept for A/swine/Miyagi/5/2003 (H1N2).
  2. b: Homologous titer was shown in bold.