Why the UK’s tick-borne disease threat is changing

The threat from ticks and tick-borne diseases is changing, and UK veterinary teams are being asked to think more dynamically about risk. Lyme disease remains the headline concern, but the bigger story is that tick exposure, pathogen distribution, and the clinical relevance of imported or formerly focal diseases are all becoming less predictable. UKHSA’s recent surveillance work confirms that Ixodes ricinus remains the UK’s dominant tick species and the main vector for Lyme disease, while veterinary sources continue to warn that babesiosis deserves attention as an emerging canine threat. (researchportal.ukhsa.gov.uk)

That shift has been building for years. UKHSA says Lyme disease has shown a gradual increasing trend since surveillance began, despite year-to-year fluctuations, and reported 1,581 laboratory-confirmed cases in 2024 in England. The agency also notes those figures likely underestimate the true burden. In parallel, the UK Tick Surveillance Scheme has helped document changes in species distribution, including the continued prominence of I. ricinus and the importance of updated local mapping for public and animal health action. (gov.uk)

For companion animal practice, the most important background issue is that canine tick-borne disease is no longer just a travel conversation. The Essex babesiosis outbreak, first described in untraveled dogs in 2015 and followed by additional locally acquired cases, showed that Babesia canis could emerge where competent vectors are present. Published follow-up work linked those cases to Dermacentor reticulatus, a tick with a localized but important UK distribution, and researchers warned that continued surveillance would be needed as the vector spread into new habitats, including urban greenspace. (pubmed.ncbi.nlm.nih.gov)

The current evidence suggests two overlapping realities. First, Lyme disease remains the more widespread and familiar threat. UKHSA reported an overall Borrelia burgdorferi sensu lato prevalence of 5.8% in sampled I. ricinus nymphs from recreational areas in England and Wales between 2021 and 2023, with site-level prevalence ranging from 0% to 30.4%. Second, babesiosis remains more geographically focal, but potentially severe, and should stay on the differential list for dogs with acute febrile illness, anemia, lethargy, thrombocytopenia, or pigmenturia, even when there’s no travel history if exposure occurred in risk areas. ESCCAP’s latest Guideline 05 reinforces that vector-borne disease prevention should be individualized and sustained, rather than treated as a one-off seasonal issue. (researchportal.ukhsa.gov.uk)

Industry and expert commentary broadly points in the same direction: vigilance, surveillance, and prevention. ESCCAP UK & Ireland materials emphasize that ticks can transmit a wide range of pathogens and that individual ticks may harbor more than one agent, which can complicate presentation and diagnosis. Vet-focused coverage has also highlighted the “changing face” of European ticks, linking growing risk to climate pressures, changing tick activity, and pet movement. That doesn’t mean every practice should treat all tick-borne diseases as equally likely, but it does mean clinicians may need a lower threshold to ask about habitat exposure, imported pets, recent travel, and regional tick activity. (esccapuk.org.uk)

Why it matters: For veterinary professionals, this is a surveillance and communication story as much as a clinical one. Practices may need to update their parasite prevention conversations with pet parents, especially in areas where historical assumptions about “low risk” no longer hold. It also strengthens the case for prompt tick identification, use of PCR or blood smear testing when babesiosis is suspected, and coordination with public health or surveillance schemes when unusual tick species or local clusters appear. Because Lyme disease is a One Health issue and babesiosis can emerge in focal pockets, small-animal teams are often the first point where changing epidemiology becomes visible. (esccapuk.org.uk)

There’s also a practical prescribing and compliance angle. Product choice matters, but so does adherence. ESCCAP advises matching preventive recommendations to the product data sheet and retreatment interval, and some UK product literature now explicitly references reduction of transmission risk from infected ticks, including canine babesiosis associated with D. reticulatus. For clinics, that means prevention messaging has to be specific, repeated, and grounded in the animal’s lifestyle, geography, and travel profile. (esccapuk.org.uk)

What to watch: The next signals will likely come from UKHSA tick mapping, APHA and surveillance-linked reporting on vector distribution, and any new locally acquired canine babesiosis cases that suggest spread beyond known focal areas. If those indicators continue moving upward, veterinary guidance may shift further toward broader, year-round tick risk management rather than narrow seasonal or travel-based advice. (researchportal.ukhsa.gov.uk)