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Table 2 Cross-HI results expressed as percent antigenic relatedness (R*)

From: Characterization of an H3N2 triple reassortant influenza virus with a mutation at the receptor binding domain (D190A) that occurred upon virus transmission from turkeys to pigs

  TK04(190Asp) TK04(190Ala)
TK04(190Asp) 100 50
TK04(190Ala) 50 100
NC03 71 50
IL04 71 35
MN05 71 100
NC05 71 50
  1. R-values were calculated based on Archetti an Horsfall formula. R = square root (r1 × r2), where r1 is the ratio of heterologous titer obtained with virus 2 to homologous titer obtained with virus 1; r2 is the ratio of the heterologous titer obtained with virus 1 to homologous titer obtained with virus 2.