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Risk factors for lyme disease in Chester County, Pennsylvania.

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To identify factors associated with increased or decreased risk of infection for
Lyme disease in Chester County, Pennyslvania.


The authors designed an unmatched case-control study involving 294 incident cases reported to the Chester County Health Department in 1998 and 449 controls selected by random digit dialing. All case and control participants were interviewed by telephone.


Age is a risk factor for
Lyme disease for groups aged 10-19 years old and 50 years or older. Sex was not a risk factor. Incidence of
Lyme disease in a rural setting was three times the incidence in an urban setting. Increased risk also was associated with living in single family homes, homes with yards or attached land, woods on the land, signs of tick hosts seen on the land, and homes within 100 feet of woodland. Gardening for more than four hours per week was also a risk factor, but most other outdoor activities were not. Twice as many participants took protective measures against tick bites before outdoor employment than those who merely ventured into the yard or land associated with the home. Only checking for ticks during outdoor activity and the use of repellents prior to outdoor activities outside the yard were unequivocally associated with a reduced risk of
Lyme disease.


It is important to increase public awareness about the risk of acquiring
Lyme disease from ticks in the immediate environment of the home.

Public Health Rep. 2001;116 Suppl 1:146-56. Research Support, U.S. Gov’t, P.H.S.

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