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Table 3 Numbers of sera with HI titer ≥40 when tested against different viruses

From: Amino acid substitutions in hemagglutinin of the 2009 pandemic influenza A(H1N1) viruses that might affect the viral antigenicity

Virus % with HI titer ≥40
Serum wave 1 (n = 59) Serum wave 2 (n = 32) Serum wave 3 (n = 33)
  CA/07 81.4 (48/59) 71.9 (23/32) 78.8 (26/33)
Thailand wave 1 Thai/104 100 (59/59) 100 (32/32) 100 (33/33)
CBI6 98.3 (58/59) 93.8 (30/32) 100 (33/33)
CBI10 91.5 (54/59) 96.9 (31/32) 100 (33/33)
Thailand wave 2 34002 100 (59/59) 90.6 (29/32) 97 (32/33)
34004 96.9 (57/59) 100 (32/32) 100 (33/33)
NMA1 100 (59/59) 93.8 (30/32) 93.3 (31/33)
Thailand wave 3 BKK1 71.2 (42/59) 81.3 (26/32) 100 (33/33)
BKK2 89.8 (53/59) 87.5 (28/32) 97 (32/33)
Thailand wave 4 BKK4 93.2 (55/59) 84.4 (27/32) 100 (33/33)
BKK5 98.3 (58/59) 100 (32/32) 100 (33/33)