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Amoebic Infections and Treatments / Parasitic Infections and Diagnostics · Journal article
Animals · August 3, 2026
A consensus or society position rather than new primary data.
This narrative review of molecular and epidemiological evidence over four decades concludes that zoonotic transmission of Giardia duodenalis is biologically possible but infrequent in the general population. However, even rare zoonotic events pose significant public health risk to vulnerable groups including children and immunocompromised individuals, who may develop severe sequelae such as chronic diarrhea, malabsorption, and failure to thrive.
Narrative review. Literature on Giardia duodenalis in humans and animals (farm, companion, wild).
Zoonotic transmission of Giardia duodenalis infection is possible, supported by molecular and epidemiological studies over four decades Most Giardia infections are host-specific, rendering zoonotic transmission relatively uncommon Vulnerable populations (children and immunocompromised individuals) face critical risk from even infrequent zoonotic transmission events, with severe outcomes including chronic diarrhea, malabsorption, and failure to thrive
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
Clinicians should remain alert to the possibility of zoonotic Giardia transmission in vulnerable populations, particularly when evaluating unexplained chronic gastrointestinal symptoms in children and immunocompromised patients with animal exposure, despite the overall rarity of cross-species transmission.
A narrative review synthesizing four decades of molecular and epidemiological evidence to conclude that zoonotic Giardia transmission is possible but uncommon, with public health implications for vulnerable populations.
As stated by the source record.
Clinicians should remain alert to the possibility of zoonotic Giardia transmission in vulnerable populations, particularly when evaluating unexplained chronic gastrointestinal symptoms in children and immunocompromised patients with animal exposure, despite the overall rarity of cross-species transmission.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
What is missing. This record has no reported figures. That is a gap in the analysis, not a judgement about the study.
Giardia duodenalis, a member of the genus Giardia, is a common intestinal protozoan parasite in humans and some farm, companion, and wild animals. Due to the uniform morphology of the parasites sampled from a wide range of hosts, the taxonomy of the genus Giardia has been the subject of debate for more than a century. The confusion generated by this controversy, and the technological limitations to carry out the necessary research to clarify the matter, led to an insufficient understanding of the epidemiology of the infection, mainly in aspects related to host specificity and zoonotic transmission. The results of molecular and epidemiological studies conducted over the last four decades, which are reviewed in this paper, allow us to conclude that zoonotic transmission of Giardia duodenalis infection is possible. Concurrently, these findings suggest that most Giardia infections are host-specific, rendering zoonotic transmission relatively uncommon. Nevertheless, from a public health perspective, such transmission remains a critical concern for vulnerable groups, particularly children and immunocompromised individuals. In these populations, even infrequent zoonotic events can lead to severe clinical outcomes, including chronic diarrhea, malabsorption, and failure to thrive.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.