Phylogenetic trees of hantaviruses based on complete M segment sequences. The tree was constructed by using the Maximum Likehood (ML) method. Numbers above branches are percentage bootstrap support values for 1000 replicates. Sequences are identified by their strain names, followed by GenBank accession numbers. The scale bars indicate 0.1 substitutions per site and sequences obtained from China during 2006–2012 are labeled with triangle.