UK tick-borne disease risk is changing for pets and people

The threat from ticks and tick-borne diseases is changing in the UK, and the shift is becoming harder for veterinary teams to treat as background noise. Recent UK Health Security Agency surveillance confirms that Ixodes ricinus remains the dominant UK tick and the main vector for Lyme disease, but it also shows an evolving picture in tick distribution and host exposure. At the same time, canine babesiosis remains a live concern because Babesia canis has been documented in UK dogs without travel history, showing that the conversation is no longer just about imported risk. (researchportal.ukhsa.gov.uk)

That broader concern has been building for years. UKHSA’s long-running Tick Surveillance Scheme has previously documented the expansion of Dermacentor reticulatus, a species of particular veterinary interest because it is a known vector of canine babesiosis. Government climate and health risk summaries also point to climate and environmental change, land use, host availability, and animal movement as factors that may alter tick distribution and disease risk over time. In other words, this is not a single-season spike but part of a longer epidemiologic trend that links companion animal health, wildlife ecology, and public health. (researchportal.ukhsa.gov.uk)

The Lyme disease side of that picture is also becoming clearer. UKHSA said the latest annual data showed 1,581 laboratory-confirmed human Lyme disease cases in 2024, and its newer field study of recreational areas in England and Wales found B. burgdorferi s.l. in 5.8% of sampled I. ricinus nymphs overall, with some sites much higher. Those findings matter to companion animal practice because dogs can act as sentinels for environmental exposure, and because pet parents increasingly expect veterinary teams to interpret tick risk in the same way they interpret flea, lungworm, or travel-associated parasite threats: locally, seasonally, and with practical prevention advice. (gov.uk)

Real-world exposure data from other high-incidence settings also help illustrate why this matters beyond abstract prevalence figures. In a recent survey of 53 people across 46 farms in southern Vermont, an area selected for high Lyme incidence and abundant tick habitat, participants reported an average of three tick encounters over the previous six months, while some reported as many as 70. Twelve percent said they had previously been diagnosed with a tick-borne disease, and the researchers noted that repeated exposure could be severe enough to affect livelihoods. Although the study was US-based, it offers a useful occupational-health lens for UK vets advising farmers, rural workers, and owners of dogs with heavy outdoor exposure.

Babesiosis remains the sharper veterinary warning sign because of its clinical severity and its implications for diagnostic thinking. UKHSA’s published investigation into the Essex cluster confirmed B. canis in dogs from Harlow with no travel outside the country, and current government disease summaries state that ongoing cases continue to be found in dogs without travel history. BSAVA has also warned that non-endemic tick-borne diseases have been identified in UK dogs, including cases presumed to have been acquired from resident ticks. For clinicians, that supports keeping babesiosis, ehrlichiosis, and other tick-borne infections on the differential list even when a pet parent reports no foreign travel. (researchportal.ukhsa.gov.uk)

Industry and expert commentary has been broadly aligned on that point. BSAVA has urged vets to stay vigilant to tick-borne disease, and parasitologist Ian Wright of ESCCAP UK and Ireland has previously warned that exotic and imported tick threats can be underestimated in practice. Separately, UKHSA’s One Health review has argued that surveillance needs to capture where tick populations are, which pathogens they carry, and when they are active, because those are the data needed to understand changing risk for both animals and people. The Vermont farmworker findings add a practical reminder that for some exposed groups, tick burden is not occasional but repeated and cumulative. (veterinary-practice.com)

Why it matters: For veterinary professionals, the changing tick threat affects more than parasite product choice. It touches triage, diagnostics, lab testing, client education, travel history-taking, and public health messaging. Practices may need to revisit how they counsel pet parents on tick checks after walks, when to discuss year-round versus seasonal prevention, and when to escalate from empirical management to blood smear review, PCR, or referral testing in dogs with fever, anaemia, lethargy, thrombocytopenia, or unexplained illness. It also reinforces the value of local knowledge: a dog’s postcode, habitat exposure, and travel history may now matter as much as the calendar. And for clients who work outdoors or live in farming settings, the occupational dimension may be worth addressing directly, because repeated tick exposure can carry both health and livelihood consequences. (bsava.com)

There is also a stewardship angle. UK policy attention has recently expanded to the environmental footprint of some flea and tick treatments, particularly fipronil and imidacloprid in waterways, which means practices are increasingly balancing parasite protection with more targeted, risk-based prescribing and clearer use instructions. That does not reduce the importance of tick prevention, but it does make case-by-case assessment and communication more important. (gov.uk)

What to watch: The next phase is likely to be driven by better surveillance and more granular local risk communication, including updated tick maps, pathogen prevalence studies, and continued scrutiny of autochthonous canine babesiosis. For practices, that means watching for fresh UKHSA surveillance outputs, BSAVA and ESCCAP guidance updates, and any evidence that established risk zones for Dermacentor reticulatus or Borrelia-positive tick populations are widening. It also means paying attention to how occupational-exposure data are used in public messaging, especially for rural and outdoor-working communities. (researchportal.ukhsa.gov.uk)