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- PublicationMétadonnées seulementPrevalence and phylogenetic analysis of tick-borne encephalitis virus (TBEV) in field-collected ticks (Ixodes ricinus) in southern Switzerland
- PublicationMétadonnées seulementRisk of Borrelia burgdorferi infection in western Switzerland following a tick biteThe aim of this study was to define the risk of developing Lyme borreliosis after a tick bite. A survey was conducted from 1993 to 1995 in the western part of Switzerland in a group of patients who presented for treatment of a recent tick bite. Only patients with negative serological tests (enzyme-linked fluorescent assay screening test, and IgG and IgM immunoblots) at the first consultation and for whom a second blood sample was available 2 months later were included in the study. Of the 376 patients included, 266 had no clinical manifestation (group 1) and 110 had a small local cutaneous reaction (
- PublicationMétadonnées seulementEpidemiology of Lyme borreliosis in French-speaking SwitzerlandThe purpose of this study was to assess the number of cases and the clinical aspects of Lyme borreliosis in French-speaking Switzerland. From July 1996 to December 1997, all laboratories performing serological tests for Lyme borreliosis sent a questionnaire to the treating physicians whenever the tests were positive. In addition, the physicians who diagnosed a case on clinical grounds only were also asked to report these cases. During this period, 1460 positive serological tests were recorded among approximately 10 360 performed (14%). A total of 775 questionnaires were returned (53%). In 3/4 of the cases, the test was ordered because of an acute clinical manifestation or a tick bite. The rest related to chronic symptoms or follow-up. In 504 cases (65%), diagnosis was considered certain or probable. These were erythema migrans in 46%, clinical manifestations of stage II in 33 % (26 facial palsy, 20 acute arthritis, 5 benign cutaneous lymphocytoma) and chronic symptoms in 21% (23 acrodermatitis, 26 neuropathies, and 8 arthritis). The adjusted incidence, estimated on the basis of the treating physician's place of residence, ranged from 9/100 000 in Valais to 95/100 000 in Neuchatel. This study indicates that Lyme borreliosis is a diagnosis frequently looked for and established in French-speaking Switzerland. Although erythema migrans is the main clinical manifestation, symptoms of stage II and III indicate that Lyme borreliosis is also responsible for relatively major systemic morbidity.
- PublicationAccès libreRickettsia conorii isolated from Rhipicephalus sanguineus introduced into Switzerland on a pet dogA tick/rickettsial survey in a household near Geneva, Switzerland, revealed that 30 (40%) of 75 nymphs and adults of the brown dog tick, Rhipicephalus sanguineus, were infected with a rickettsial agent biologically and antigenically indistinguishable from R. conorii, the causative agent of boutonneuse fever. Introduced in 1976 from either southern France of Italy by the family''s pet dog, the tick infestation had steadily increased until 1981 when control measures were initiated. During 1980 and 1981, four persons associated with the household''s pet dog contracted a febrile illness diagnosed as boutonneuse fever.