Gern, Lise

1998, Zhioua, Elyes, Gern, Lise, Aeschlimann, André, Sauvain, Marie-Josephe, Van der Linden, Sjef, Fahrer, Heinz

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 1987-autumn 1987) period, rates of seroconversion were 0.6 % 2.7 % and 2.1 % respectively. During the first and second period, clinical incidence were 1.0 % and 0.25 % respectively. No active lyme borreliosis was detected during the third period. Among orienteers who seroconverted during the study (n = 16), only two developed clinical symptoms. Hence, Borrelia burgdorferi infection is often asymptomatic.

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

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 1986-printemps 1987) et la troisième (printemps 1987-automne 1987), les taux de séroconversion ont été respectivement de 0,6 %, 2,7 %, et 2,1 %. Lors des première et deuxième périodes, l'incidence clinique a été respectivement égale à 1,0 % et 0,25 %. Aucun cas clinique n'a été observé durant la troisième période. Parmi les coureurs ayant présenté une séroconversion durant cette étude (n = 16), deux seulement ont développé des symptômes cliniques. Il semble donc que l'infection à Borrelia burgdorferi soit souvent asymptomatique., 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 1987-autumn 1987) period, rates of seroconversion were 0.6 %, 2.7 % and 2.1 % respectively. During the first and second period, clinical incidence were 1.0 % and 0.25 % respectively. No active Lyme borreliosis was detected during the third period. Among orienteers who seroconverted during the study (n = 16), only two developed clinical symptoms. Hence, Borrelia burgdorferi infection is often asymptomatic.