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Table 2 Hemagglutination inhibition antibody titer of sera collected 2 week after boost immunization

From: Prokaryote-expressed M2e protein improves H9N2 influenza vaccine efficacy and protection against lethal influenza a virus in mice

   HI titers (GMT)a  
H9N2 H5N2 H3N2
Control < 20 < 20 < 20
1xM2e < 20 < 20 < 20
4xM2e < 20 < 20 < 20
Inactivated vaccine (H9N2) 245.11 < 20 < 20
1xM2e + vaccine 375.5 < 20 < 20
4xM2e + vaccine 929.55 < 20 < 20
  1. a HI antibody titers were determined against A/chicken/Korea/ma163/04 (ma163/H9N2), A/aquatic bird/Korea/maW81/05 (maW81/H5N2), or A/Philippines/2/82 (Phil82/H3N2) viruses of the highest dilution of sera that inhibited hemagglutination by 4HA units of viruses. The results are the geometric mean titer of positive sera (≥20).