Table 3. Genotypes identified in Vietnam from 2001 to 2007.
| Virus | Virus segment | Year | Genotype | |||||||
| HAa | NA | PB2 | PB1 | PA | NP | MP | NS | |||
| Gs/VN/113/01 | clade 3 GX22-like; 98.8b | GX22-like; 99.1 | NDc | ND | ND | ND | ND | ND | 2001 | VN1 |
| Ck/VN/NCVD8/03 | clade 5 F1-like; 97.7 | F1-like; 98.7 | F1-like; 99.0 (GX4016-like; 98.7)d | F1-like; 97.8 | F1-like; 97.8 | F1-like; 98.5 | E319-like; 99.2 (GX4016-like; 99.3) | F1-like; 98.7 (GX4016-like; 97.3) | 2003 | VN2 |
| Dk/VN/NCVD-7/07 | clade 1 HK821-like; 97.5 | HK821-like; 97.6 | HK821-like; 98.4 | HK821-like; 98.3 | HK821-like; 97.8 | HK821-like; 98.4 | HK821-like; 98.3 | HK821-like; 97.3 | 2003–2007 | VN3 |
| Ck/VN/10/05 | clade 2.3.2 GX4016-like; 98.9 (E319-like; 98.6) (GX604-like; 98.6) | GX4016-like; 99.1 (E319-like; 98.7) | F1-like; 98.6 (GX4016-like; 99.1) | GX4016-like; 99.2 | GX4016-like; 99.3 | E319-like; 99.1 (FJ584-like; 98.0) (GX4016-like; 98.6) | E319-like; 98.9 (GX4016-like; 99.6) | F1-like;97.6 (GX4016-like;98.9) | 2005 | VN4 |
| Dk/VN/8/05 | clade 0 HK97-like; 97.8 | HK97-like; 97.7 | HK97-like; 97.6 | HK97-like; 99.4 | HK97-like; 98.2 | HK97-like; 98.2 | HK97-like; 99.1 | HK97-like; 99.7 | 2005 | VN5 |
| Ck/VN/NCVD-44/07 | clade 2.3.4 FJ584-like; 97.9 | FJ584-like; 98.0 | GX604-like; 98.3 (E319-like; 97.2) | FJ584-like; 98.7 (E319-like; 98.1) | FJ584-like; 98.4 | E319-like; 99.1 (FJ584-like; 97.7) (GX4016-like; 98.7) | FJ584-like; 99.0 | FJ584-like; 98.7 | 2007 | VN6 |
| Ck/VN/NCVD-20/07 | clade 2.3.4 FJ584-like; 98.1 | GX4016-like; 97.6 (E319-like; 97.3) | GX604-like; 98.3 (E319-like; 97.3) | FJ584-like; 98.8 (E319-like; 98.2) | FJ584-like; 98.0 | E319-like; 99.1 (FJ584-like; 97.7) (GX4016-like; 98.6) | FJ584-like; 98.8 | FJ584-like; 98.3 | 2007 | VN7 |
| M.Dk/VN/NCVD-22/07 | clade 2.3.4 FJ584-like; 98.2 | GX4016-like; 97.5 (E319-like; 97.3) | GX604-like; 97.9 (E319-like; 97.1) | FJ584-like; 98.7 (E319-like; 98.1) | HK821-like; 96.8 | HK821-like; 98.6 | FJ584-like; 98.6 | HK821-like; 98.2 | 2007 | VN8 |
| Dk/VN/NCVD-43/07 | clade 2.3.4 FJ584-like; 97.3 | HK821-like; 98.1 | HK821-like; 97.2 | FJ584-like; 96.5 (E319-like; 96.3) | HK821-like; 98.3 | HK821-like; 98.6 | HK821-like; 98.9 | HK821-like; 97.3 | 2007 | VN9 |
a
Based on the WHO HA nomenclature for HPAI H5N1 [10].
b
The number indicates the nucleotide sequence identity percentile between each gene segment of a representative Vietnam H5N1 virus and the corresponding gene from the putative progenitor virus.
c
ND denotes the associated segment sequence is not available.
d
The precursor virus outside the parenthesis is the primary precursor virus, which had a closer phylogenetic relationship to a specific Vietnam virus lineage than the other potential precursor virus shown within the parenthesis. If a lineage had more than one potential precursor, only one virus was marked as the primary precursor-like virus and other closely related viruses were listed within parentheses.