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Lyme Disease Vectors in Alberta, information and support for Lyme in Canada



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Lyme Disease Vectors in Alberta

J Parasitol. 1998 Oct;84(5):902-6.

Host preferences and temporal trends of the tick Ixodes angustus in north-central Alberta.

Sorensen TC, Moses RA.

Department of Biological Sciences, University of Alberta, Edmonton, Canada.

We examined host preferences and temporal trends of the tick Ixodes angustus on small mammals in north-central Alberta. Small mammals were live-trapped from 1 June to 29 September 1994 and 3 May to 30 June 1995 in mature aspen (Populus tremuloides) forest near Lac La Biche, Alberta. Abundance of female I. angustus was high in early May (0.90 +/- 0.20 [SE]) and peaked again in late June (0.58 +/- 0.16), whereas abundance of immature I. angustus peaked (1.2 +/- 0.35) in mid-July. Red-backed voles (Clethrionomys gapperi) and deer mice (Peromyscus maniculatus) were the most common host species encountered, and tick abundance (number of ticks per animal examined) on these hosts was strongly influenced by species and sex. Clethrionomys gapperi had higher tick abundance (0.73 +/- 0.07) than did P. maniculatus (0.04 +/- 0.01), and ticks were more abundant on large male C. gapperi (0.97 +/- 0.14) than they were on large female C. gapperi (0.36 +/- 0.08; P = 0.0007). Characteristics of each species and sex of host in relation to susceptibility to parasitism are discussed.

Here is research showing Ixodes Angutus as a competent vector of lyme and co-infections as well as Ixodes spinipalpis

Experimental and Applied Acarology, January 2000, vol. 24, no. 1, pp. 77-84(8)

Abstract:

The vector competence of Ixodes angustus for Borrelia burgdorferi sensu stricto (s.s.) was investigated in the laboratory. The larval progeny of female ticks from Washington State were placed on Swiss-Webster mice that had been inoculated intravenously with 10^8 spirochetes each of a Californian isolate of B. burgdorferi. Spirochetes were detected in 6 (12%) of 50 nymphs derived from larvae that had fed on these animals. Ten nymphs from the same cohort of experimentally infected ticks were placed on each of 4 naive deer mice (Peromyscus maniculatus). One of the mice seroconverted to B. burgdorferi and spirochetes were isolated from its ear tissues 4 weeks after exposure to ticks. Further vector competence trials were conducted with I. angustus ticks from California. Larvae were fed on deer mice that had been inoculated intradermally with B. burgdorferi along with larvae of I. spinipalpis as a comparison group. There was no significant difference in the prevalence of infection in nymphs of I. angustus (8.2%) versus those of I. spinipalpis (12.1%). We conclude that I. angustus is a competent experimental vector of B. burgdorferi s.s. and its efficiency for acquiring and transstadially passing such spirochetes is similar to that of I. spinipalpis.