| taxonomic status of ixodes neotomae and i. spinipalpis (acari: ixodidae) based on mitochondrial dna evidence. | ixodes spinipalpis hadwen & nuttall and i. neotomae cooley are enzootic vectors of borrelia burgdorferi johnson, schmid, hyde, steigerwalt & brenner in western north america. the taxa overlap in host preference, habitat, and morphology. mitochondrial dna was compared between the taxa to test for reproductive isolation. a 300-bp region of the mitochondrial 16s ribosomal dna gene was amplified in 28 specimens of i. neotomae and 149 specimens of i. spinipalpis. these products were screened for sequ ... | 1997 | 9439125 |
| risk of human exposure to vector ticks (acari: ixodidae) in a heavily used recreational area in northern california. | the risk of humans encountering vector ticks along hiking trails or in picnic grounds in a lyme disease-endemic area was evaluated in a multipurpose recreational area (tilden regional park) in the populous san francisco bay region of california. four hillside hiking trails (two high-use, two low-use) were sampled by dragging and walking through low vegetation biweekly for one year; four heavily used picnic areas were sampled concurrently by dragging. adults of three human-biting ticks were enume ... | 1996 | 8780455 |
| distribution and molecular analysis of lyme disease spirochetes, borrelia burgdorferi, isolated from ticks throughout california. | previous studies describing the occurrence and molecular characteristics of lyme disease spirochetes, borrelia burgdorferi, from california have been restricted primarily to isolates obtained from the north coastal region of this large and ecologically diverse state. our objective was to look for and examine b. burdorferi organisms isolated from ixodes pacificus ticks collected from numerous regions spanning most parts of california where this tick is found. thirty-one isolates of b. burgdorferi ... | 1993 | 8308101 |
| influence of abiotic and environmental factors on the density and infection prevalence of ixodes pacificus (acari:ixodidae) with borrelia burgdorferi. | the abiotic and biotic factors that govern the spatial distribution of lyme disease vectors are poorly understood. this study addressed the influence of abiotic and biotic environmental variables on ixodes pacificus cooley & kohls (acari:ixodidae) nymphs, because it is the primary vector of borrelia burgdorferi johnson, schmidt, hyde, steigerwaldt & brenner in the far-western united states. three metrics of lyme disease risk were evaluated: the density of nymphs, the density of infected nymphs, ... | 2011 | 21337944 |