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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

Un grand nombre de micro-organismes de type rickettsien ont été observés dans les cellules des ébauches ovariennes de larves et de nymphes d'Ixodes ricinus, lors de la mue. La morphologie de ces organismes est identique chez toutes les tiques examinées. Ils mesurent 0,3-0,4 µm de diamètre et 0,6-1,3 µm, parfois jusqu’à 2,5 µm, de long. Ils possèdent une paroi externe...

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

Des coureurs d'orientation venant de toutes les régions de Suisse (n = 416) ont participé à une étude prospective de la borréliose de Lyme. Au printemps 1986, la séroprévalence était de 28,1 %. Au début de l'étude, 84,3 % des coureurs d'orientation ont signalé avoir été piqués par des tiques. Durant la première période (printemps 1986-automne 1986), la deuxième (automne...

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