Table 3.
Neutralization titers of ferret sera against A(H1N1)pdm09 viruses.
| Vaccine Strain: | Ferret ID Immunized against: | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Singapore a | WD039-0 b | GR156 e | GR253 f | ||||||
| 111 | 112 | 121 | 122 | 131 | 132 | 141 | 142 | ||
| 2017–2019 season | Singapore a | 64 | 64 | 64 | 64 | 32 | 32 | 4 | <4 |
| 2018–2019 season | WD039-0 b | 64 | 64 | 128 | 256 | 64 | 128 | 8 | 8 |
| BB251 c | 64 | 64 | 128 | 256 | 64 | 128 | 8 | 8 | |
| 2019–2020 season | BB262 d | 64 | 64 | 64 | 128 | 64 | 128 | 4 | 8 |
| GR156 e | 32 | 32 | 32 | 64 | 64 | 64 | <4 | 4 | |
| GR253 f | <4 | <4 | 4 | 8 | <4 | <4 | 32 | 64 | |
| AC109 g | <4 | <4 | 4 | 8 | <4 | 4 | 32 | 64 | |
a A/Singapore/GP1908/2015, b A/Tokyo/UT-WD039-0/2019, c A/Tokyo/UT-BB251/2019, d A/Tokyo/UT-BB262/2019, e A/Tokyo/UT-GR156/2019, f A/Tokyo/UT-GR253/2020, and g A/Tokyo/UT-AC109/2020 were used. Boldface type indicates homologous combinations.