Tick threats are shifting for UK pets, vets, and public health

The threat from ticks and tick-borne diseases is changing, and the shift is becoming easier to quantify. In the UK, human Lyme disease remains the clearest signal: UKHSA reported 1,581 laboratory-confirmed cases in 2024, while noting that confirmed cases still underestimate the real burden. At the same time, newer surveillance and field studies are painting a more complex picture for veterinary teams, with changing tick distribution, variable pathogen prevalence between regions, and ongoing concern about canine babesiosis as an emerging or locally established risk in some areas. (gov.uk)

That broader concern has been building for years. Earlier UK work on Dermacentor reticulatus, the key vector for Babesia canis, identified established foci in western Wales, north and south Devon, and Essex, with some more recent detections in urban greenspace in Essex. Separately, analysis of the Essex babesiosis outbreak found that although D. reticulatus foci were already known in the UK, endemic canine babesiosis had not been considered established before the winter 2015-2016 cluster. Investigators concluded that the combination of endemic tick foci, pet travel, and dog importation created conditions for local transmission. (researchportal.ukhsa.gov.uk)

More recent surveillance suggests the overall tick landscape is broader than many clinicians may assume. UKHSA’s Tick Surveillance Scheme recorded 3,182 tick records and 27 tick species from 2021 to 2024, confirming that Ixodes ricinus remains the UK’s dominant tick and the primary vector for Lyme disease and tick-borne encephalitis. The agency also said its updated mapping and tick-bite incidence metrics are intended to support more targeted local interventions, which matters because risk is not evenly distributed and likely remains underdetected in some regions. (researchportal.ukhsa.gov.uk)

For Lyme disease specifically, the latest UKHSA-linked research adds useful granularity. In a 2025 study sampling 84 sites across 36 recreational areas in England and Wales between 2021 and 2023, researchers found an overall Borrelia burgdorferi sensu lato prevalence of 5.8% in I. ricinus nymphs, with site-level prevalence ranging from 0% to 30.4%. Tick density was higher in woodlands than grasslands and increased in the presence of deer, while the highest densities of infected nymphs were identified in places including Kielder Forest, the Yorkshire Dales, Exmoor, the Blackdown Hills, and South Devon. UKHSA has separately said that, on average, about 4% of ticks in England and Wales are infected, although some areas can average 8% to 10%. (researchportal.ukhsa.gov.uk)

Industry and policy reaction has focused heavily on prevention and movement controls. The British Veterinary Association’s current pet travel position says it is concerned that the removal of compulsory tick treatment increased the risk of UK exposure to non-native tick species and the diseases they may carry, citing the Essex babesiosis cases as evidence of that vulnerability. That stance aligns with the longer-running view among parasitology and vector-borne disease experts that imported pets, travel, and environmental change can interact with existing local tick populations in ways that alter disease risk faster than clinical habits change. (bva.co.uk)

Why it matters: For veterinary professionals, this is a surveillance story, a clinical story, and a client-communication story all at once. Practices may need to think less in terms of a fixed “tick season” or a small set of known hotspots, and more in terms of changing local ecology, travel history, and differential diagnosis. In dogs with pyrexia, anaemia, lethargy, thrombocytopenia, shifting-leg lameness, or vague post-travel illness, vector-borne disease may deserve a lower threshold for consideration than it did a decade ago. It also strengthens the case for clearer conversations with pet parents about routine tick checks, prompt tick removal, travel-associated prophylaxis, and the fact that some tick-borne risks affect both animals and people. (gov.uk)

There’s also a wider context here. Although your core sources focus on companion animals in the UK, newer US research underscores the same directional trend: exposure is intensifying for people and animals who spend sustained time outdoors. A January 2026 Binghamton University release on a Vermont farmworker study reported that 12% of respondents had ever been diagnosed with a tick-borne disease, participants averaged three tick encounters over six months, and some reported as many as 70 encounters. That study is not directly about UK pets, but it reinforces the broader point that tick exposure patterns are changing in real-world working environments, not just in surveillance datasets. (newswise.com)

What to watch: The next developments to watch are updated UK tick distribution maps, any further evidence of local babesiosis establishment outside known foci, and whether regulators or professional bodies push harder on travel-related tick treatment and year-round prevention messaging. (researchportal.ukhsa.gov.uk)