Table 5. Amino acid differences between the NY99 and KEN West Nile virus strainsa,b.
| Viral gene | Amino acid position | NY99 | KEN |
|---|---|---|---|
| Capsid a | 3 | Leu | Asn |
| Capsid | 8 | Val | Ala |
| Envelope | 126 | Ile | Thr |
| Envelope | 159 | Val | Ile |
| NS1 | 70 | Ala | Ser |
| NS2a | 52 | Thr | Ala |
| NS2b | 103 | Val | Ala |
| NS3 | 249 | Pro | Thr |
| NS3 | 356 | Thr | Ile |
| NS4a | 85 | Ala | Val |
| NS4b | 249 | Glu | Asp |
aSource (17). bKEN, West Nile virus strain from Kenya; Leu, leucine; Val, valine; Ile, isoleucine; Ala, alanine; Thr, threonine; Pro, proline; Glu, glutamine; Asn, asparagine; Ser, serine; Asp, aspartic acid. cVariable structural amino acid residues have been designated by bold text.