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Small mammals are important hosts for the instar stages of <jats:italic>Ixodes ricinus<\/jats:italic> ticks, the principal vector of Lyme disease in Europe. Small mammals also act as reservoirs of <jats:italic>Borrelia afzelii<\/jats:italic>, the most common genospecies of the <jats:italic>Borrelia burgdorferi<\/jats:italic> sensu lato (s.l.) spirochetes causing Lyme disease in Europe. However, we lack quantitative estimates on whether different small mammal species are equally suitable hosts for feeding<jats:italic> I. ricinus<\/jats:italic> and whether they show differences in pathogen transmission from host to tick.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Here, we analysed the feeding success and prevalence of <jats:italic>B. burgdorferi<\/jats:italic> s.l. infections in 12,987 instar I. ricinus found on captured small mammals with known infection status in Norway (2018\u20132022).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>We found that larvae were more likely to acquire a blood meal from common shrews (<jats:italic>Sorex araneus<\/jats:italic>, 46%) compared to bank voles (<jats:italic>Myodes glareolus<\/jats:italic>, 31%) and wood mice (<jats:italic>Apodemus sylvaticus<\/jats:italic>, 36%). Nymphs tended to be more likely to acquire a blood meal from wood mice (66%) compared to bank voles (54%). Common shrews harboured few nymphs (n=19). Furthermore, we found that larvae feeding on infected bank voles (11%) were more likely to be infected with <jats:italic>B. burgdorferi<\/jats:italic> s.l. than larvae on infected common shrews (7%) or wood mice (4%).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Our study provides quantitative evidence of differences in suitability for the instar stages of <jats:italic>I. ricinus<\/jats:italic> across taxa of small mammals and highlights how even known small mammal host species can differ in their ability to feed ticks and infect larval ticks with the pathogen causing Lyme disease.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Graphical Abstract<\/jats:title>\n                \n              <\/jats:sec>","DOI":"10.1186\/s13071-023-06110-7","type":"journal-article","created":{"date-parts":[[2024,1,18]],"date-time":"2024-01-18T16:03:26Z","timestamp":1705593806000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Vector competence of Ixodes ricinus instars for the transmission of Borrelia burgdorferi sensu lato in different small mammalian hosts"],"prefix":"10.1186","volume":"17","author":[{"given":"Lars K.","family":"Linds\u00f8","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hildegunn","family":"Viljugrein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Atle","family":"Mysterud","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,1,18]]},"reference":[{"key":"6110_CR1","doi-asserted-by":"publisher","first-page":"990","DOI":"10.1038\/nature06536","volume":"451","author":"KE Jones","year":"2008","unstructured":"Jones KE, Patel NG, Levy MA, Storeygard A, Balk D, Gittleman JL, et al. 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