Circulation of Giardia duodenalis in domestic and wild animals from Amazon region: A systematic review

•G. duodenalis cosmopolitan assemblages A and B prevail within domestic and wild animals in the Amazon.•Giardia microscopic screening in aquatic animals from Amazon showed its prevalence including the endangered species Trichechus inunguis (manatee).•In the Amazon, a biodiversity hotspot, there is a gap concerning Giardia speciesand their assemblages in animals. Giardia is an ubiquitous protozoa that infect a broad range of vertebrate hosts, including domestic and wild animals as well as humans. Giardia duodenalis is one of the most common parasite in humans and mammals worldwide. Human giardiasis is highly prevalent in the countries that make up from Amazon. The identification of genotypes in humans and animals improves the understanding of transmission routes and the control strategies. Thus, we carried out a systematic review on Giardia in animals from Amazon region/South American, following the PRISMA guidelines. Studies up to September, 2022 were searched for in public database. A total of seven out of 432 articles were selected: four, two and one from Brazil, Colombia and Peru, respectively. Based on these articles it is seen that the G. duodenalis cosmopolitan assemblages A and B prevail within domestic and wild animals in the Amazon. Moreover, a Giardia microscopic screening in aquatic animals from this biome showed its prevalence among aquatic mammals including the endangered species Trichechus inunguis (manatee). Therefore, a yet not accessed number of susceptible hosts, new G. duodenalis assemblages and species can be occurring in this huge hotspot of biodiversity that is Amazon region. [Display omitted]