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. Author manuscript; available in PMC: 2011 Jan 27.
Published in final edited form as: Vet Microbiol. 2009 Mar 20;140(3-4):256. doi: 10.1016/j.vetmic.2009.03.017

Figure 1.

Figure 1

A phylogenetic tree based on the complete genomic sequences of 30 human, swine, and avian HEV strains. Genotypes 1 and 2 HEV are restricted to humans, whereas genotypes 3 and 4 HEV infect both humans and swine. The avian HEV likely belongs to a separate species within the family. A scale bar, indicating the number of character state changes, is proportional to the genetic distance. Modified with permission by the Society for General Microbiology from Huang et al (2004).