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. 2015 Oct 13;9(6):331–340. doi: 10.1111/irv.12333

Table 6.

Comparison of MN and HI titres of influenza B viruses (Yamagata-lineage)

Viruses Genetic clade-amino acid identities at HA1 positions 196-198 Virus passage history** Post-infection ferret antisera*; MN/HI titres
B/Florida/4/2006 B/Wisconsin/1/2010 B/Estonia/55669/2011 B/Massachusetts/02/2012
MN HI MN HI MN HI MN HI
Reference virus
 B/Florida/4/2006 1-DKT E7 540 640 161 160 61 160 796 640
 B/Wisconsin/1/2010 3-DKT E5 844 160 330 160 41 10 450 320
 B/Estonia/55669/2011 2-NKT M2 71 160 24 80 152 640 155 160
 B/Massachusetts/02/2012 2-DKT E7 663 320 133 160 ND*** 80 734 640
Test virus
 B/Denmark/8/2012 3-NKT M3 170 80 52 10 159 80 231 160
 B/Denmark/3/2012 3-NKT M4 239 40 134 40 73 20 99 80
 B/Ireland/13M98449/2013 3-NKT Cx 187 40 129 40 32 40 112 80
 B/Hong Kong/432/2013 3-NKT M2 203 80 140 40 25 40 130 160
 B/Stockholm/8/2012 2-NKT M2 226 80 136 80 95 640 95 80
 B/Paris/2327/2013 2-NKT M2 213 40 77 40 94 160 106 80
 B/Cameroon/13v-2053/2013 2-NKT M2 120 40 51 20 63 320 100 80
 B/Moldova/462/2013 2-NKT M2 143 40 48 20 149 640 91 80
*

Raised against the viruses indicated; homologous titres for reference viruses are shown in boldface type.

**

Passage in eggs (E); MDCK cells (M); cells of unspecified type (C); numbers indicate the number of passages (x  =  unknown number).

***

Not done.