Fig. 2

Phylogenetic relationship among Giardia duodenalis assemblages and sub-assemblages revealed by a maximum likelihood analysis of the partial bg rDNA gene. Substitution rates were calculated by using the general time reversible model. Numbers on branches are percent bootstrapping values over 70% using 1,000 replicates. The red human silhouettes indicate the nucleotide sequences generated in the present study. The filled red, blue, and yellow circles indicate the nucleotide sequences of sub-assemblages AI, AII, and AIII, respectively. The world map logos indicate reference sequences. Human, animal, and environmental sequences retrieved from GenBank were included in the analysis for comparative purposes