Fig. 5
From: High prevalence of hepatitis E virus infection among domestic pigs in Ibaraki Prefecture, Japan
Phylogenetic tree analysis of HEV. Molecular phylogenetic tree analysis using the maximum likelihood method based on the partial sequences 336 nucleotides of ORF2 of HEV. The substitution model was GTR + gamma + Invariant. Strains collected from the farm in this study were labeled with black circles on the basis of piglet number and age in weeks. Strains collected from the slaughterhouse were labeled with black triangles. Other reference strains representatives of subtypes 3a, 3b, and 3e of the genotype 3 are shown. Numbers at branch nodes show bootstrap values with ≥70% support. Scale bar = 0.05 nucleotide substitutions per position. The strains detected in Ibaraki Prefecture were shown in bold type