Genotype III phylogenetic tree constructed using the method of Neighbor-joining with 1000 bootstrap replications. Some viruses of each genotype I, II and IV were used as outgroup. Branch lengths are proportional to percentage divergence. Tamura Nei (TrN+G) nucleotide substitution model was used with gamma distribution (G) of 0.2796. The Lineage and Sub-lineages are marked. Amino acids changes are indicated on the tree. Bootstrap support values are shown for key nodes only.