Document Detail

Temporal and spatial distribution of Ixodes pacificus and Dermacentor occidentalis (Acari: Ixodidae) and prevalence of Borrelia burgdorferi in Contra Costa County, California.
MedLine Citation:
PMID:  8510115     Owner:  NLM     Status:  MEDLINE    
The seasonal activity and spatial distribution of adult and immature Ixodes pacificus Cooley & Kohls and Dermacentor occidentalis Marx were determined along trails and on hillsides in two parks in Contra Costa County, CA. I. pacificus and D. occidentalis adults were most numerous in January and May, respectively. Adult ticks were significantly more abundant along heavily vegetated trails than on open grassy hillsides, and on the uphill versus the downhill side of trails. Five species of rodents were captured, and numbers of I. pacificus and D. occidentalis larvae per rodent were highest in May-June and July, respectively. Few nymphs were recovered either by flagging or from captured rodents. An average of 2.2 and 2.8% of the I. pacificus adults collected from the two parks were infected with the Lyme disease spirochete, Borrelia burgdorferi Johnson, Schmid, Hyde, Steigerwalt & Brenner. The greatest risk of contracting Lyme disease from adult I. pacificus in these two Contra Costa County parks is during the winter months, especially while hiking near the uphill side of trails.
V L Kramer; C Beesley
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of medical entomology     Volume:  30     ISSN:  0022-2585     ISO Abbreviation:  J. Med. Entomol.     Publication Date:  1993 May 
Date Detail:
Created Date:  1993-07-15     Completed Date:  1993-07-15     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0375400     Medline TA:  J Med Entomol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  549-54     Citation Subset:  IM    
Contra Costa Mosquito Abatement District, Concord, CA 94520.
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MeSH Terms
Acari / microbiology*
Borrelia burgdorferi Group*
California / epidemiology
Rodentia / parasitology*
Tick Infestations / epidemiology

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