The diversity and the distribution of tick species and their infection rates by the pathogenic micro-organism Borrelia burgdorferi sensu lato, the etiologic agent of Lyme borreliosis, and Rickettsia sp., were studied in Canton Ticino (the southern part of Switzerland).
Ticks specimens collected from animals and humans were classified and analysed for the presence of both pathogens.
In particular, PCR analysis was performed for the detection of Borrelia spirochetes in Ixodes ricinus and Ixodes hexagonus, and the hemolymph test was done on Rhipicephalus sanguineus for the detection of Rickettsia sp.
PCR assays, performed on 424 of the 989 collected ticks, revealed a low rate of infection (around 2%) of both vectors I. ricinus and I. hexagonus by B. burgdorferi sensu lato.
These results are in agreement with the modest number of Lyme borreliosis cases yearly recorded in Ticino.
Further, through analysis of DNA sequences, the strains carried by the infected ticks were identified as belonging to the genomic group VS 116.
The widespread finding of the Mediterranean species Rhipicephalus sanguineus in different locations from July 1994 to October 1995 demonstrates its establishment in Ticino.
Of the 210 specimens collected, 70 were analysed and one was infected by Rickettsia sp.
Mots-clés Pascal : Lyme maladie, Borréliose, Spirochétose, Bactériose, Infection, Vecteur, Zoonose, Epidémiologie, Borrelia burgdorferi, Spirochaetaceae, Spirochaetales, Bactérie, Rickettsia, Rickettsieae, Rickettsiaceae, Rickettsiales, Répartition géographique, Pouvoir infectant, Ixodes ricinus, Ixodidae, Ixodida, Parasitiformes, Acari, Arachnida, Arthropoda, Invertebrata, Rhipicephalus sanguineus, Suisse, Europe, Ixodes hexagonus
Mots-clés Pascal anglais : Lyme disease, Borrelia infection, Spirachaetosis, Bacteriosis, Infection, Vector, Zoonosis, Epidemiology, Borrelia burgdorferi, Spirochaetaceae, Spirochaetales, Bacteria, Rickettsia, Rickettsieae, Rickettsiaceae, Rickettsiales, Geographic distribution, Infectivity, Ixodes ricinus, Ixodidae, Ixodida, Parasitiformes, Acari, Arachnida, Arthropoda, Invertebrata, Rhipicephalus sanguineus, Switzerland, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0243391
Code Inist : 002A37A. Création : 11/06/1997.