Larvae of Ixodes ricinus transmit Borrelia afzelii and B. miyamotoi to vertebrate hosts
Gilian van DuijvendijkEmail author, Claudia Coipan, Alex Wagemakers, Manoj Fonville, Jasmin Ersöz, Anneke Oei, Gábor Földvári, Joppe Hovius, Willem Takken and Hein Sprong
Parasites & Vectors20169:97 | DOI: 10.1186/s13071-016-1389-5 | © van Duijvendijk et al. 2016
Received: 8 December 2015 | Accepted: 17 February 2016 | Published: 20 February 2016
Lyme borreliosis is the most common tick-borne human disease and is caused by Borrelia burgdorferi sensu lato (s.l.). Borrelia miyamotoi, a relapsing fever spirochaete, is transmitted transovarially, whereas this has not been shown for B. burgdorferi (s.l). Therefore, B. burgdorferi (s.l) is considered to cycle from nymphs to larvae through vertebrates. Larvae of Ixodes ricinus are occasionally B. burgdorferi (s.l) infected, but their vector competence has never been studied.
We challenged 20 laboratory mice with field-collected larvae of I. ricinus. A subset of these larvae was analysed for infections with B. burgdorferi (s.l) and B. miyamotoi. After three to four challenges, mice were sacrificed and skin and spleen samples were analysed for infection by PCR and culture.
Field-collected larvae were naturally infected with B. burgdorferi (s.l) (0.62 %) and B. miyamotoi (2.0 %). Two mice acquired a B. afzelii infection and four mice acquired a B. miyamotoi infection during the larval challenges.
We showed that larvae of I. ricinus transmit B. afzelii and B. miyamotoi to rodents and calculated that rodents have a considerable chance of acquiring infections from larvae compared to nymphs. As a result, B. afzelii can cycle between larvae through rodents. Our findings further imply that larval bites on humans, which easily go unnoticed, can cause Lyme borreliosis and Borrelia miyamotoi disease.
Ixodes ricinus Larva Borrelia burgdorferi Borrelia miyamotoi Transmission Infection Vector Tick Rodent
Topics with information and discussion about published studies related to Lyme disease and other tick-borne diseases.
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