Table 2. Amino acid variation between fox and gull-derived highly pathogenic avian influenza (A)H5N1 virus sequences, Northern Ireland, July 2023 (n = 4).
| Sample source | Sequence | Amino acid mutations | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PB2 | PB1 | PB1-F2 | NP | NA | M1 | M2 | NS1 | |||||
| 271 | 535 | 187 | 7 | 63 | 402 | 193 | 115 | 187 | 23 | 225 | ||
| Fox 1 | A/red fox/Northern Ireland/22185/2023 | A | M | R | T | F | S | V | I | K | S | T |
| Fox 2 | A/red fox/Northern Ireland/22191/2023 | T | I | R | I | F | S | V | I | K | S | T |
| Gull 2 | A/common gull/Northern Ireland/23006/2023 | T | M | K | T | F | S | V | I | K | S | T |
| Gull 1 | A/common gull/Northern Ireland/23002/2023 | T | M | R | T | S | K | I | V | R | N | A |
Variant residues are indicated in bold.