ArticleParasites & vectors2026
A recombinase polymerase amplification lateral flow assay (RPA-LF) for detection of Babesia divergens-like parasites.
Article in Parasites & vectors, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundBabesia divergens is a tick-borne apicomplexan parasite found predominantly in Europe, causing babesiosis in livestock and occasionally in humans, with severe disease reported in immunosuppressed or asplenic individuals. As populations of Ixodes ricinus, the principal vector, expand geographically, including into urban environments, there is a growing need for rapid, sensitive, and field-deployable surveillance tools. In this study, we aim to developed a Recombinase Polymerase Amplification Lateral Flow (RPA-LF) assay for the detection of B. divergens.
methodsRPA assays targeting B. divergens hsp70, cox1, and 18S rRNA genes were designed and evaluated for sensitivity and specificity using serial dilutions and control samples, including other apicomplexan parasites and tick samples spiked with B. divergens DNA. To assess field performance, 279 I. ricinus ticks were collected from urban parks in Greater London and screened by qPCR and a subset also tested using the new RPA-LF assays. Anaplasma phagocytophilum was screened by qPCR but not detected.
resultsThe cox1 and 18S rRNA RPA-LF assays demonstrated high specificity, with detection limits of at least 10
conclusionsWe report the first successful development of an RPA-LF assay for the detection in ticks of B. divergens or the closely related species B. capreoli. The assay demonstrates high sensitivity and specificity under isothermal conditions and provides a portable and reliable tool for field-based molecular surveillance of emerging tick-borne pathogens. Field validation revealed B. divergens/B. capreoli in questing ticks from urban green spaces in London, underscoring the importance of this tool for early detection and ongoing surveillance of tick-borne parasites in expanding urban ecosystems.
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