UK tick-borne disease risk is widening 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 a niche issue. Human public health surveillance, veterinary guidance, and published research all point in the same direction: ticks are being encountered across a wider range of environments, Lyme disease remains established, and other pathogens, including Babesia canis, are now part of the routine risk conversation for some dogs in Britain. (gov.uk)

What’s driving that change is a mix of ecology, climate, land use, wildlife movement, and pet travel. UKHSA has said ticks remain the main disease vector of concern in the UK and has linked climate-sensitive vector-borne disease risk to changing environmental conditions. Its recent surveillance publications show that Ixodes ricinus, the principal UK vector for Lyme disease and tick-borne encephalitis virus, remains the most commonly reported tick and is being tracked through updated distribution and tick-bite incidence mapping. Separate research using the UK Tick Surveillance Scheme has also identified possible expansion of I. ricinus into new areas of Great Britain. (gov.uk)

The Lyme disease picture illustrates the point. UKHSA reported 1,581 laboratory-confirmed Lyme disease cases in England in 2024, while also cautioning that confirmed cases underestimate the true burden. More detailed hazard work published from England and Wales found that the density of nymphs infected with Borrelia burgdorferi sensu lato was significantly higher in northern and southern England than in central England and Wales, suggesting that risk is not uniform and that local context matters. For practices, that means broad national awareness still needs to be paired with area-specific prevention and triage advice. (gov.uk)

Babesiosis is the other reason this story matters now. APHA guidance says Babesia canis was reported in untraveled dogs in Essex and that cases without travel history have continued, marking a notable shift from the traditional assumption that most UK canine tick-borne disease is imported. The original southern England emergence paper traced a 2015-2016 Harlow cluster to Dermacentor reticulatus, a tick with limited but important distribution in England and Wales and a known vector of canine babesiosis in Europe. Current guidance highlights fever, lethargy, anorexia, anemia, thrombocytopenia, jaundice, and pigmenturia as key clinical features, with blood smear review and PCR used for diagnosis. APHA also notes that imidocarb dipropionate is an important treatment option, although it is not licensed for this indication in UK dogs. (gov.uk)

Expert and industry commentary has become more direct on the need to update assumptions. ESCCAP UK & Ireland’s latest vector-borne disease guideline says ticks in dogs and cats can transmit a wide range of pathogens and notes that individual ticks may harbor more than one pathogen, which can complicate clinical presentation. ESCCAP’s tick guidance also warns that tick exposure is no longer confined to obvious countryside settings, with ticks and tick-borne diseases documented even in suburban gardens. In a recent Vet Times article, parasitologist Ian Wright wrote that ticks and their pathogens are a growing threat to UK pets, reflecting both increased exposure potential and pet movement. (esccapuk.org.uk)

Why it matters: For veterinary professionals, this is a surveillance story, a clinical story, and a communication story all at once. It argues for more consistent parasite prevention discussions, more attention to geography and travel history within the UK, and a lower threshold for considering tick-borne disease in dogs with vague systemic illness. It also reinforces the One Health angle: the same environmental trends affecting dogs are affecting people. UKHSA’s messaging is increasingly aligned with occupational-health research showing that tick exposure is becoming more embedded in day-to-day outdoor life rather than limited to exceptional exposure events. In a recent Binghamton University-led survey of 53 people across 46 farms in southern Vermont, 12% reported ever being 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. One farmer had developed Lyme carditis severe enough to require open-heart surgery. That study is not directly transferable to the UK, but it helps illustrate the practical burden of repeated exposure in high-risk outdoor settings and why routine prevention messaging matters. (gov.uk)

There are still important limits to the evidence. Lyme disease case counts are acknowledged to be underestimates, local tick abundance can vary sharply, and babesiosis remains geographically clustered rather than uniformly distributed across the UK. Occupational exposure findings from US farm settings should also be interpreted cautiously when applied to British practice. But the direction of travel is clear: veterinary teams are being asked to manage a more dynamic tick landscape than they were a decade ago, with surveillance data, public health agencies, and parasite experts increasingly aligned on that point. (gov.uk)

What to watch: Watch for further UKHSA mapping updates, additional reporting on non-travel-associated canine babesiosis, and stronger region-specific prevention recommendations from ESCCAP and frontline practices as surveillance data mature through 2026. It will also be worth watching whether more occupational and behavioral research helps sharpen prevention advice for people with frequent outdoor exposure, since that may increasingly shape the wider One Health conversation around ticks. (researchportal.ukhsa.gov.uk)