Initial genotyping of Giardia cyst DNA extracted from the infected patient fecal samples using beta-giardin (bg), triose-phosphate isomerase (tpi) and glutamate dehydrogenase (gdh) typing showed that AS98 had a multi-locus genotype (MLG) corresponding to MLG AII-2 [7] and AS175 had the AII-1 MLG. Here, TPI1 is linked to giardiasis.