Table 2. Gene origin and percent homology of SIV RNA segments compared with pandemic (H1N1) 2009 virus, Thailand*.
| Influenza (H1N1) virus | PB2 (1–2229)† | PA (1–2153)† | NA (1–1347)† | M (1–982)† | HA (1–1698)† | NS (1–778)† | NP (1–1443)† | PB1 (1–2153)† |
|---|---|---|---|---|---|---|---|---|
| Pandemic (H1N1) 2009‡ |
Avian TRIG |
Eurasian swine |
Classical swine |
Human TRIG |
||||
| SIV from Thailand§ |
Eurasian swine |
Classical swine |
Eurasian swine |
|||||
| RA4 |
Avian TRIG |
Eurasian swine |
Classical swine |
Human TRIG |
||||
| RA9 |
Avian TRIG |
Eurasian swine |
Classical swine |
Human TRIG |
||||
| RA20¶ |
Eurasian swine |
Classical swine |
Eurasian swine |
|||||
| 83.1% |
85.1% |
89.5% |
94.2% |
86.4% |
90.8% |
82.4% |
85.1% |
|
| RA29 |
Avian TRIG |
Eurasian swine |
Classical swine |
Human TRIG |
||||
| RA114 |
Avian TRIG |
Eurasian swine |
Classical swine |
Human TRIG |
||||
| RA204¶ |
Eurasian swine |
Classical swine |
Eurasian swine |
|||||
| 83.2% |
85.2% |
89.5% |
94.2% |
86.8% |
90.8% |
82.3% |
85.1% |
|
| RA15 |
Avian TRIG |
Eurasian swine |
Classical swine |
Human TRIG |
||||
| RA75 | Avian TRIG | Eurasian swine | Classical swine | Human TRIG | ||||
*All swine influenza virus (SIV) isolates except RA20 and RA204 have >99% homology with corresponding genes of A/Nonthaburi/102/2009. PB, polymerase B; PA, polymerase A; NA, neuraminidase; M, matrix; HA, hemagglutinin; NS, nonstructural; NP, nucleoprotein; TRIG, triple reassorted internal gene. †Nucleotide positions compared. ‡A/Nonthaburi/102/2009 (H1N1) virus. §A/sw/Ratchaburi/NIAH1481/2000 (H1N1) virus. ¶Percent homology of compared sequences with those of corresponding genes of A/Nonthaburi/102/2009.