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National Chung Hsing University Institutional Repository - NCHUIR > 獸醫學院 > 微生物暨公共衛生學研究所 > 依資料類型分類 > 期刊論文 >  Acarologic risk of exposure to Borrelia burgdorferi spirochaetes: long-term evaluations in north-western California, with implications for Lyme borreliosis risk-assessment models

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/134061

標題: Acarologic risk of exposure to Borrelia burgdorferi spirochaetes: long-term evaluations in north-western California, with implications for Lyme borreliosis risk-assessment models
作者: Eisen, L.;Eisen, R.J.;Chang, C.C.;Mun, J.;Lane, R.S.
張照勤
關鍵字: Borrelia burgdorferi;Ixodes pacificus;deer;long-term study;Lyme;borreliosis;nymphs;risk assessment;spatial scale;California;USA;ixodes-pacificus acari;lizard sceloporus-occidentalis;scapularis;acari;ixodidae nymphs;reservoir competence;climatic conditions;reduced abundance;disease risk;ticks acari;deer
日期: 2004
Issue Date: 2012-12-14 10:28:03 (UTC+8)
關連: Medical and Veterinary Entomology, Volume 18, Issue 1, Page(s) 38-49.
摘要: Over a 5-year period (1997-2001) the population densities of Ixodes pacificus Cooley & Kohls (Acari: Ixodidae) nymphs infected with spirochaetes of Borrelia burgdorferi sensu lato (s.l.) were evaluated in areas of 2000 ha at two localities (CHR, nine sites; HREC, seven sites) 25 km apart in Mendocino County, north-western California. The 5-year median density of infected nymphs was significantly higher at CHR than at HREC (0.51 vs. 0.09 per 100 m(2)) and site-specific yearly densities exceeding one infected nymph per 100 m(2) were 10-fold more likely to occur at CHR than at HREC. The importance of long-term data in acarologic risk assessment was demonstrated by significantly higher median yearly densities of infected nymphs at CHR from 1997 to 1999, whereas both areas had similar densities during 2000-2001. Overall, the causative agent of Lyme borreliosis in North America, B. burgdorferi Johnson et al. sensu stricto (s.s.) accounted for 76% of 46 genetically characterized B. burgdorferi s.l. infections from I. pacificus nymphs. Tremendous variability in acarologic risk was recorded within both areas: yearly densities of infected nymphs varied 11-97-fold between sites at CHR and 8-30-fold at HREC. Part of this variation could be explained by environmental traits, most notably deer usage. However, correlations between environmental factors and density of infected nymphs (for CHR and HREC combined) did not necessarily apply when these areas were considered separately. Thus, a Lyme borreliosis ecology model developed in one of these areas needs testing in the other area.
Relation: Medical and Veterinary Entomology
Appears in Collections:[依資料類型分類] 期刊論文
[依教師分類] 張照勤

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