Mapping ticks (Acari: Argasidae, Ixodidae) and informing local public actions: Insights from the United Kingdom Ticks Surveillance Scheme (2021-2024)

Abstract

The Tick Surveillance Scheme (TSS) is a citizen science initiative which relies on public and professional submissions to monitor tick species distribution, seasonal exposure, and host associations across the United Kingdom (UK). During the period 2021–2024, 3182 tick records were received and 27 tick species were detected. The data confirm that Ixodes ricinus, the primary vector for Lyme disease and Tick-borne encephalitis, remains the most common tick in the UK. The TSS continues to detect imported tick species, underscoring the risk of novel pathogens entering the country, with new species like Hyalomma excavatum and Rhipicephalus pulchellus reported for the first time. The scheme also provides crucial evidence of non-endemic species like Hyalomma marginatum being found on hosts without history of foreign travel, although establishment risk is currently considered low. In addition to updated species distribution maps, a new tick-bite incidence metric has been developed and translated into a heat map for England and Wales. Updated regularly, this enables targeted public health interventions and awareness campaigns at the local authority level, providing a proxy for potential tick exposure. Tick submissions are likely underrepresented from Scotland and Northern Ireland, suggesting a need to strengthen outreach in these areas to improve data accuracy.

Dr Sara Gandy

Research Associate

My research primarily focuses on understanding the ecological drivers of tick-borne diseases to provide insights on the mechanisms involved in transmission cycles, especially on the interactions between ticks, hosts and pathogens. My research includes investigating the impacts of environmental changes (woodland restoration, rewilding) and host community composition (deer, rodent and birds) on tick-borne diseases risks in the UK. Some of my findings uncovered an opposing effect of deer densities on Lyme disease hazard through their positive effects on tick density and negative effects on infection prevalence. I also published work looking at spatiotemporal changes in tick distribution using passive surveillance data and I have been leading the National Tick Survey, which involves collaborating with stakeholders in thirty National Parks and recreational areas to collect ticks and test them for various tick-transmitted pathogens between 2021 and 2024. The goal is to understand disease hazard and temporal variation in areas visited by members of the public and deliver tick awareness messages.