Figure 1.

A PhyML phylogenetic tree (GTR model) based on the 18S ribosomal gene of the three pathogens discussed in this study. Sequences obtained from genbank (https://www.ncbi.nlm.nih.gov/genbank/) were aligned using ClustalW version 2 [179] and the trees calculated using seaview version 4 [189]. The tree was rooted with Giardia intestinalis (AF473852.1) and Giardia ardeae (Z17210.1). Bootstrap analysis was performed using 1000 pseudo-replicates. The scale bar shows the evolutionary distance for the nucleotide substitutions per site.