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Tick larvae on dog, deer and human skin.
A survey of the vector ticks for Rickettsia spp. was performed on ticks from dogs, deer and humans in southern Norway. Of the samples of dog, deer and human ticks, 13.3, 14.8 and 4.4% were infected with Rickettsia typhi, respectively. The percentage of dogs that tested positive was significantly higher (p<,0.0001) than that of deer or humans. The rate of infection was independent of the location of the sampling, and there was no relationship between the location and the time of sampling of the ticks. It is suggested that dogs may act as a reservoir host for R. typhi and, consequently, that they may be important in the epidemiology of this pathogen.