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Aeschlimann, André
Nom
Aeschlimann, André
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Fonction
Professeur honoraire
Email
audrey.aeschlimann@unine.ch
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Voici les éléments 1 - 10 sur 74
- PublicationAccès libre
- PublicationAccès libreEtude séroépidémiologique de l'encéphalite à tiques et de la Borreliose de Lyme en Suisse(1994)
- PublicationAccès libreIxodes ricinus immatures on birds in a focus of Lyme borreliosis(1993)
; The infestation of birds by immature Ixodes ricinus was studied during 6 months in a Swiss woodland, where Lyme borreliosis is endemic. Thirteen passerine species were found to be parasitized by /. ricinus subadults and specially Turdus merula, T, philomelos and Erithacus rubecula. Overall, 300 larvae and 162 nymphs were collected on 95 avian hosts. Prevalence of infestation of nymphs on birds was higher in spring; larvae peaked in summer. The infection of birds by Borrelia burgdorferi was also studied using blood cultivation and examinations of ticks. Motionless spirochetes were isolated from two E. rubecula. Infected ticks were removed from five species of passerines, and mainly three species of Turdidae (T. merula, T. phllomelos and E. rubecula}. Infection rate of larvae and nymphs by spirochetes averaged 16.3% and 21.7%, respectively. These percentages, compared to the infection rate of questing ticks collected through dragging, suggest that some Turdidae may play a role as amplifying hosts for spirochetes in the focus. - PublicationAccès libreEtude morphologique des Ixodidae S. Str. (Schultze, 1937) de Suisse au microscope électronique à balayage(1993)
; Morel, P. C.Le rôle épidémiologique de certaines espèces de tiques du genre Ixodes est actuellement bien démontré. La nécessité de mieux connaître leur morphologie nous a donc conduit à mener une étude au microscope électronique à balayage (M.E.B.) des Ixodes de Suisse, dans le but d'identifier les espèces avec sûreté quelque soit le stade évolutif considéré. I. ricinus, 1. apronophorus, I. trianguliceps, I. hexagonus, I. canisuga, I. rugicollis, I. arboricola, I. lividus et I. vespertilionis ont pu être étudiés. La plupart des spécimens proviennent de la « collection AESCHLIMANN » déposée au Musée Zoologique de Lausanne. Les principales caractéristiques morphologiques ont été passées en revue et sont illustrées par des photographies, tandis que les résultats sont résumés sous forme de clés de détermination., The epidemiological importance of some ticks of the genus Ixodes has already been proved. Necessity of a better knowledge of their morphology has led us to undertake a scanning electron microscope (S.E.M.) study of Ixodes ticks in Switzerland, in order to be able to accurately identify the species independent of the development stage examined. I. ricinus, I. apronophorus, I. trianguliceps, I. hexagonus, I. canisuga, I. rugicollis, I. arboricola, I. lividus and I. vespertilionis have been studied. Most of these tick specimens were from the « collection AESCHLIMANN » deposited at the Lausanne Zoological Museum. The main morphological features are illustrated by micrographs, and results presented in determination keys. - PublicationAccès libreBiology of Ixodes (Pholeoixodes) hexagonus under laboratory conditions. Part I. Immature stages(1993)
; A rearing method for Ixodes (Pholeoixodes) hexagonus, the hedgehog tick, was established which enabled the life cycle of immature stages to be studied under laboratory conditions. Larvae were fed on Swiss mice and nymphs on the cars of New Zealand rabbits. The feeding time of the larvae and nymphs on both hosts was 4–17 days. Larvae moulted to nymphs 15–21 days after detachment from mice. The premoulting period was 13–26 days for newly emerged males and 15–27 days for females. Engorged nymphs which developed into males weighed less (5.64±0.91 mg) than those that developed into females (6.019±88mg). The sex ratio (male: female) under laboratory conditions was 1:1.13. - PublicationAccès libreConfirmation that Rickettsia helvetica sp. nov. Is a Distinct Species of the Spotted Fever Group of Rickettsiae(1993)
; Raoult, DidierWe propose the name Rickettsia helvetica sp. nov. for a rickettsial serotype of unknown pathogenicity isolated in 1979 in Switzerland from Ixodes ricinus ticks and designated the Swiss agent. The growth characteristics and the results of microimmunofluorescence serologic typing, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, Western blotting (immunoblotting) with specific mice sera, and a polymerase chain reaction followed by restriction fragment length polymorphism analysis confirmed previously reported preliminary findings which suggested that this rickettsia, to which a name was given provisionally, does represent a new member of the spotted fever group of rickettsiae. The type strain is C3 (Reference Center for Rickettsioses, Marseille, France). - PublicationAccès libreThe Ecology of Lyme Borreliosis in Europe(1992)
; ; Krampitz, H. E. - PublicationAccès libre
- PublicationAccès libreTicks and discease : susceptible hosts, reservoir hosts, and vectors(1991)Tick species vary in the number of hosts fed upon during the life cycle, the specificity they have for certain host taxa, and the mode of transmission, among other life history details. What, then, is the definition of a 'natural focus' of a tick disease in an endemic region? It is the smallest possible intersection of a habitat (or microhabitat) in which the whole cycle of a parasitosis may be achieved in the wild, including the reservoir hosts, nutritional hosts, ticks and transmissible pathogens. Humans or domestic animals may reveal such a focus, when entering one. They become sick, and one observes the acquired disease clinically or serologically. Such a natural, focus may 'export' infected ticks with hosts. If such ticks are infected and leave the hosts out of a natural focus, they can begin new foci. I call such emigrations a 'pulsation' from an original focus. Young rodents, birds, or migrating large mammals may play an important role in originating new foci of diseases and then creating new endemic regions. The possibility that ticks transmit their pathogens through the eggs, over many generations (transovarial transmission), means that ticks act not only as vectors but also as reservoirs of the pathogens they transmit.
- PublicationAccès libreIxodes (Pholeoixodes) hexagonus, an efficient vector of Borrelia burgdorferi in the laboratory(1991)
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