Giardia cases in England reach highest level since 2016

• Giardia cases in England have surged to the highest level since 2016, with an 11.4% increase in 2025, signalling a significant epidemiological shift that warrants increased clinical vigilance for parasitic infection presentations.
• London is experiencing the highest disease burden, suggesting potential localised transmission patterns or risk factors that clinicians in high-prevalence areas should consider when evaluating patients with compatible symptoms.
• Doctors should maintain heightened suspicion for giardiasis in patients presenting with acute gastroenteritis, particularly in London, and ensure appropriate stool microscopy or antigen testing is performed to enable timely diagnosis and treatment.

Cases up 11.4% in 2025, with London recording the highest number of cases.

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