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

Tick-borne disease risk is shifting in the UK, with implications that reach well beyond traditional Lyme disease discussions. Recent UKHSA surveillance shows Ixodes ricinus remains the country’s most common tick and the main vector for Lyme disease, while updated hazard mapping suggests infected ticks are established across a broad geographic range. At the same time, veterinary literature continues to flag canine babesiosis as an emerging concern, tied to Dermacentor reticulatus ticks and to locally acquired cases in dogs without travel history, especially since the Essex outbreak drew attention to the disease’s ability to establish in focal areas. ESCCAP’s latest vector-borne disease guidance also underscores that tick-borne threats in dogs and cats are evolving, not static. (researchportal.ukhsa.gov.uk)

Why it matters: For veterinary professionals, the message is that tick risk assessment can’t rely on old geographic assumptions or travel history alone. Lyme disease remains the dominant zoonotic concern, with UKHSA reporting 1,581 laboratory-confirmed Lyme disease cases in 2024 and noting that confirmed cases likely underestimate the true burden. Meanwhile, babesiosis, though still more localized, raises the stakes for rapid recognition of pyrexia, anemia, lethargy, hemoglobinuria, and thrombocytopenia in dogs, plus clear prevention counseling for pet parents on tick checks, prompt removal, and seasonally appropriate ectoparasite control. (gov.uk)

What to watch: Watch for further UK surveillance updates on tick distribution, Lyme hazard mapping, and whether localized canine babesiosis foci expand beyond currently recognized areas. (researchportal.ukhsa.gov.uk)