Int. J. Environ. Res. Public Health 2012, 9 906 Figure 5. Phylogenetic tree based on the partial nucleotide sequences of Hexon gene (250 bp) of AdV strains. The strains of the present study are in bold face. Scale indicates genetic distance. 3.4.5. HAstV Phylogenetic analysis of ORF2 (232 bp) sequences of three HAstV strains showed clustering of two, one each from March and October, with the type 8 strain Yuc-8 (AF260508, Mexico) and that of one (October) with the type 7 strain (Y08632, Norway) with 100% and 99.4% nucleotide identity, respectively (Figure 6, Table 3).