Table 3.
Antigenic analysis of B/Victoria‐lineage viruses isolated in Japan during the 2018‐2019 season
| Virus | Passage history | Genetic clade | Hemagglutination inhibition titer | ||
|---|---|---|---|---|---|
| Ferret antiserum | |||||
| B/Brisbane/60/2008 | B/Texas/02/2013 | B/Colorado/06/2017 | |||
| Reference viruses | |||||
| B/Brisbane/60/2008 | MDCKXa | 1A | 2560 | 640 | 320 |
| B/Texas/02/2013 | MDCK6 | 1A | 1280 | 1280 | 160 |
| B/Colorado/06/2017 | MDCK4 | 1A (Δ2 aa) | 640 | 160 | 1280 |
| Test viruses | |||||
| B/Tokyo/UT‐BB200/2019 | hCK2 | 1A (Δ2 aa) | 640 | 80 | 1280 |
| B/Tokyo/UT‐BB207/2019 | hCK2 | 1A (Δ2 aa) | 640 | 160 | 1280 |
| B/Tokyo/UT‐BB241‐0/2019 | hCK2 | 1A (Δ3 aa) | 640 | 80 | 320 |
| B/Tokyo/UT‐BB248‐0/2019 | hCK2 | 1A (Δ3 aa) | 320 | 80 | 160 |
| B/Tokyo/UT‐WD050‐0/2019 | hCK2 | 1A (Δ3 aa) | 320 | 80 | 160 |
Homologous titers are underlined and bolded.
a
X, unknown passage number.