Laboratory-based Surveillance for Hepatitis E Virus Infection, United States, 2005–2012
. . Genetic relatedness among hepatitis E virus (HEV) strains identified in hepatitis E cases, United States. Phylogenetic tree was constructed from a segment of HEV open reading frame 1 generated in MEGA5 (www.megasoftware.net) by using the neighbor-joining method. Country, year reported, and numeric or GenBank accession number assignment are denoted. Scale bar indicates genetic distance.