Objective: In order to evaluate the potential zoonotic transmission of Giardia duodenalis, isolates from humans and dogs in the Northwestern region of the São Paulo State, Brazil were characterized based on the β-giardin gene.
Methods: The samples were analyzed by sequencing of the Nested-PCR products.
Results: The A1 and A2 subgenotypes were detected in human and dogs. Cysts of assemblage B, C and D have not been found in any isolates studied.
Conclusions: These results are consistent with the view that giardiasis in the largest endemic region of the Brazil should not be seen as a single entity.