Table 2.
Summary of virus score characteristics for H5N1 clade categories 1 and 2, and four H7N9 profiles.
| strain | virus score, V (i) (5th; 95th percentile) | receptor preference | presence of known mutations | reassortments within virus | stalk deletion in NA | phylogenetic relatedness of HA to HA of strains circulating in humans |
|---|---|---|---|---|---|---|
| H5N1 clade 1 | 0.27 (0.21; 0.33) | α2,3 | mutations | none | long stalk | different |
| H5N1 clade 2 | 0.08 (0.03; 0.14) | α2,3 | none | none | long stalk | different |
| H7N9 profile 7 | 0.60 (0.58; 0.61) | α2,6 | none | acquisition | short stalk | different |
| H7N9 profile 15 | 0.84 (0.78; 0.89) | α2,6 | mutations | none | short stalk | different |
| H7N9 profile 23 | 0.30 (0.23; 0.36) | α2,3 | none | acquisition | short stalk | different |
| H7N9 profile 31 | 0.53 (0.43; 0.64) | α2,3 | mutations | acquisition | short stalk | different |