Table 4.
Hemagglutination inhibition results of influenza B virus isolates (2019–2020) using ferret antisera.
| Virus a | Clade b | Ferret Reference Sera c | ||||||
|---|---|---|---|---|---|---|---|---|
| B/Nevada/ 03/2011 |
B/Texas/ 02/2013 |
B/Brisbane/ 60/2008 |
B/Colorado/ 6/2017 |
B/Washington/ 02/2019 (Egg) |
B/Washington/ 02/2019 (Cell) |
B/Wisconsin/1/2010 | ||
| B/Nevada/03/2011 | V1A | 1280 | 320 | 640 | 20 | 160 | 80 | 10 |
| B/New Jersey/01/2012 | V1A | 1280 | 640 | 320 | 40 | 40 | 40 | <10 |
| B/Texas/02/2013 | V1A | 320 | 320 | 160 | 40 | 40 | 40 | <10 |
| B/Florida/78/2015 | V1A | 1280 | 1280 | 640 | 80 | 80 | 80 | 20 |
| B/Brisbane/60/2018 | V1A | 640 | 320 | 1280 | 40 | 160 | 40 | 10 |
| B/Colorado/06/2017 | V1A-2DEL | 40 | 20 | 0 | 320 | 40 | 160 | <10 |
| B/Hong Kong/286/2017 | V1A.3-3DEL | 320 | 160 | 160 | 80 | 320 | 160 | 10 |
| B/Washington/02/2019 (egg) | V1A.3-3DEL | 320 | 80 | 80 | 80 | 640 | 640 | <10 |
| B/Washington/02/2019 (cell) | V1A.3-3DEL | 80 | 40 | 10 | 80 | 320 | 640 | <10 |
| B/Rhode Island/01/2019 | V1A.3-3DEL | 320 | 160 | 320 | 40 | 320 | 320 | 10 |
| B/Phuket/3073/2013 | Y3 | 10 | <10 | <10 | <10 | <10 | <10 | 1280 |
| CS20N004 | V1A.3-3DEL | 80 | 40 | 10 | 160 | 320 | 640 | <10 |
| CS20N005 | 80 | 40 | 10 | 160 | 320 | 640 | <10 | |
| CS20N006 | 80 | 80 | 20 | 160 | 640 | 1280 | <10 | |
| CS20N017 | 80 | 40 | 10 | 160 | 320 | 640 | <10 | |
| CS20N020 | 80 | 40 | 10 | 160 | 640 | 1280 | <10 | |
| CS20N025 | 80 | 40 | 20 | 160 | 640 | 1280 | 10 | |
| CS20N028 | 80 | 40 | 10 | 160 | 320 | 640 | <10 | |
| CS20N029 | 80 | 40 | 20 | 160 | 640 | 1280 | <10 | |
| CS20N031 | 80 | 40 | 10 | 160 | 320 | 640 | <10 | |
| CS20N036 | 80 | 40 | 20 | 160 | 640 | 1280 | 10 | |
| CS20N053 | 80 | 40 | 10 | 160 | 640 | 1280 | <10 | |
| CS20N056 | 80 | 40 | 20 | 160 | 640 | 1280 | <10 | |
| CS20N057 | 40 | 20 | 10 | 80 | 320 | 640 | <10 | |
| CS20N062 | 40 | 40 | 10 | 160 | 640 | 1280 | <10 | |
| CS20N068 | 40 | 20 | 10 | 80 | 640 | 1280 | <10 | |
| CS20N091 | 80 | 40 | 10 | 160 | 320 | 640 | <10 | |
| CS20N098 | 40 | 20 | 10 | 80 | 320 | 640 | <10 | |
| CS20N113 | 40 | 20 | 10 | 160 | 320 | 640 | <10 | |
| CS20N126 | 40 | 20 | 10 | 80 | 320 | 640 | <10 | |
| CS20N137 | 80 | 20 | 10 | 160 | 320 | 640 | <10 | |
| CS20N140 | 80 | 20 | 10 | 160 | 320 | 640 | <10 | |
| CS20N168 | 80 | 40 | 20 | 160 | 640 | 1280 | <10 | |
| CS20N174 | 80 | 40 | 10 | 160 | 320 | 640 | <10 | |
| CS20N210 | 80 | 40 | 20 | 160 | 320 | 640 | 10 | |
| CS20N212 | 80 | 40 | 20 | 160 | 640 | 1280 | <10 | |
| CS20N213 | 80 | 40 | 20 | 160 | 320 | 640 | <10 | |
| CS20N214 | 80 | 40 | 20 | 160 | 320 | 640 | <10 | |
| CS20N228 | 80 | 40 | 20 | 160 | 640 | 1280 | 10 | |
| CS20N274 | 80 | 40 | 10 | 160 | 320 | 640 | 10 | |
| CS20N294 | 80 | 40 | 10 | 80 | 320 | 640 | <10 | |
| CS20N349 | 40 | 20 | 10 | 80 | 320 | 640 | <10 | |
| CS20N351 | 80 | 40 | 10 | 160 | 640 | 1280 | <10 | |
a The viruses underlined are the vaccine strains used in the 2019–2020 influenza season. Passage 2 viruses for all Missouri isolates were used in the serological assays. b The 3DEL noted in clades occurs at positions 162–164 on the HA protein. c The homologous hemagglutination inhibition titers were marked in bold.