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Université de Neuchâtel

Regulation of body volume by salivation in a tick challenged with fluid loads

Kaufman, W. R. ; Aeschlimann, André ; Diehl, Peter A.

In: American Journal of Physiology, 1980, vol. 238, no. 1, p. R102-R112

Injection into the hemolymph of 1.2% NaCl, 11.2% sucrose, 2.3% urea (all approximately isosmotic to hemolymph), or distilled water induced salivary fluid secretion in the ixodid tick Amblyomma hebraeum Koch. Saline gave the largest response at high doses. Injection of hyperosmotic NaCL into the hemolymph did not induce salivation but led to the drinking of distilled water in amounts sufficient to...

Université de Neuchâtel

Rickettsia-like microorganisms in the ovarian primordial of molting Ixodes ricinus (acari : ixodidae) larvae and nymphs

Zhu, Z ; Aeschlimann, André ; Gern, Lise

In: Annales de parasitologie humaine et comparée, 1992, vol. 67, no. 4, p. 99-110

A large number of coccoid, or oval to spindle-shaped rickettsialike microorganisms are detected intracellularly within the primordial ovaries of all examined molting larvae and nymphs, descendants of a female Ixodes ricinus collected in a forest near Neuchâtel, Switzerland, and within all molting nymphal I. ricinus captured as starved ticks in the same area. The morphology of the...

Université de Neuchâtel

Borrelia burgdorferi in a focus of Lyme borreliosis: epizootiologic contribution of small mammals

Humair, Pierre-François ; Turrian, N ; Aeschlimann, André ; Gern, Lise

In: Folia Parasitologica, 1993, vol. 40, no. 1, p. 65-70

The contribution of woodmice (Apodemus sylvaticus), yellow-necked mice (Apodemus flavicollis) and bank voles (Clethrionomys glareolus) was compared in a focus of Lyme borreliosis in Switzerland during a 7 months' study. All three species of mice and one species of shrews (Sorex araneus) were shown parasitized by infected Ixodes ricinus immatures. About 14% of...

Université de Neuchâtel

Longitudinal study of Lyme borreliosis in a high risk population in Switzerland

Zhioua, Elyes ; Gern, Lise ; Aeschlimann, André ; Sauvain, Marie-Josephe ; Van der Linden, Sjef M ; Fahrer, Heinz

In: Parasite, 1998, vol. 5, no. 4, p. 383-386

Orienteers from all parts of Switzerland (n = 416) were included in a longitudinal study for Lyme borreliosis. In spring 1986, the seroprevalence was 28.1 %. At the beginning of the study, 84.3 % of orienteers reported a history of tick bite, and 3.8 % reported a past history of Lyme borreliosis. During the first (spring 1986-autumn 1986), second (autumn 1986-spring 1987) and third (spring...

Université de Neuchâtel

Infection of field-collected Ixodes ricinus (Acari: Ixodidae) larvae with Borrelia burgdorferi in Switzerland

Zhioua, Elyes ; Aeschlimann, André ; Gern, Lise

In: Journal of Medical Entomology, 1994, vol. 31, no. 5, p. 763-766

Free-living larvae from natural areas in five regions in Switzerland were collected to determine the infection rate of Ixodes ricinus L. larvae by Borrelia burgdorferi Johnson. Larvae were examined for the spirochetes using direct fluorescent antibody assay. Of 652 larvae examined, spirochetes were detected in 20 (3.1%). No differences in infection rate among sites were detected....

Université de Neuchâtel

Changes in the protein profile and antigenicity of different Borrelia burgdorferi strains after reintroduction to Ixodes ricinus ticks

Min Hu, Chang ; Gern, Lise ; Aeschlimann, André

In: Parasite Immunology, 1992, vol. 14, no. 4, p. 415-427

Eight Swiss strains of Borrelia burgdorferi, with various protein profiles and the North-American strain B31 were artificially introduced into Ixodes ricinus ticks and reisolated 10 days later. All isolates were subsequently examined by SDS-PAGE analysis. Comparing initial isolates with the reisolates, we observed that 7 out of 9 strains changed their protein pattern with respect to...

Université de Neuchâtel

Importation of “Exotic” Ticks (Ixodoidea) in Switzerland

Aeschlimann, André ; Chatelanat, P.

In: Zentralblatt für Bakteriologie, Mikrobiologie und Hygiene A, 1984, vol. 256, p. 270-271