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Table 4 Serum avidity in indirect HA1 ELISA

From: Distinction of subtype-specific antibodies against European porcine influenza viruses by indirect ELISA based on recombinant hemagglutinin protein fragment-1

Recombinant HA Serum specificity
  H1N1pdm–A/Bayern/74/2009a H1N1av –A/swine/Belzig/2/2001 H3N2 – A/swine Belzig/54/2001
  No urea Urea AVI (%) No urea Urea AVI (%) No urea Urea AVI (%)
A/Germany/R26/2011 (H1N1pdm) 2,332 b 1,273 55 1,011 0,163 16 0,286 0,108 38
A/Swine/Germany/R2035/2011 (H1pdmN2) 1,359 0,266 20 0,292 0,109 37 0,306 0,099 32
A/Swine/Germany/R1738/2010 (H1N1av) 0,209 0,112 54 1,241 0,312 25 0,291 0,107 37
A/swine/Germany/R1207/2010 (H1N2) 0,176 0,16 91 0,078 0,061 78 0,087 0,06 69
A/swine/Germany/R76/2011 (H3N2) 0,182 0,111 61 0,159 0,121 76 0,768 0,147 19
  1. a Subtype and designation of influenza A virus isolate used to raise the respective serum.
  2. b Bold face indicates homologous rec HA1 – serum pair.
  3. AVI (%) - percentage avidity index.