Figure 1. Phylogenetic trees based on available complete nucleotide sequences of Japanese encephalitis virus. The tree was constructed using the neighbour-joining method. Horizontal branch lengths are proportional to genetic distance. Genotypes are indicated on the right. The IND-WB-JE1 and IND-WB-JE2 strains were isolated in the state of West Bengal. GenBank accession numbers for viruses shown are given in table II.