UK tick threat shifts as Lyme and babesiosis risks evolve

CURRENT BRIEF VERSION: Ticks are becoming a more complex veterinary and public health threat in the UK, with Lyme disease still the dominant concern, canine babesiosis now established in at least some local foci, and surveillance data suggesting both tick exposure and pathogen risk are shifting. UKHSA said 1,581 laboratory-confirmed Lyme disease cases were reported in England in 2024, while emphasizing that confirmed cases likely underestimate the true burden. Separate UKHSA surveillance and research updates show Ixodes ricinus remains the UK’s most common tick, Borrelia prevalence in sampled nymphs in England and Wales was 5.8% between 2021 and 2023, and tick-borne encephalitis virus is now considered likely to be present in England, even though the public risk remains very low. For dogs, babesiosis remains a more localized but important concern, especially after the well-documented Essex outbreak in untraveled dogs linked to Babesia canis and Dermacentor reticulatus ticks. (gov.uk)

Why it matters: For veterinary professionals, the story is no longer just “more ticks.” It’s a changing risk map that affects preventive conversations, differential diagnoses, and client education. UKHSA says around 4% of ticks are infected on average in England and Wales, with some areas averaging 8% to 10%, and newer mapping work suggests meaningful regional variation in infected tick density. That means practices may need a more risk-based approach to year-round tick prevention, especially for dogs with outdoor exposure, travel history, or access to known Dermacentor habitats. It also reinforces the One Health angle: rising tick exposure affects pets, pet parents, farm workers, and the wider public. A recent Binghamton University-led survey of 53 individuals across 46 farms in southern Vermont found 12% had ever been diagnosed with a tick-borne disease, participants reported an average of three tick encounters over the previous six months, and some reported as many as 70, underscoring how occupational exposure can intensify as tick ranges and activity patterns change. (ukhsa.blog.gov.uk)

What to watch: Watch for updated UK tick surveillance maps, any further spread of Dermacentor reticulatus–associated babesiosis beyond known hotspots, and whether practices begin formalizing more geographically tailored tick prevention advice. (ukhsa-dashboard.data.gov.uk)