Primary Outcome: Lyme disease. We will assess disease incidence in children by their answer to question number seventeen on the follow up questionnaire We will confirm our cases with medical record review from individuals reporting a tick-borne illness or symptoms consistent with disease. All non-respondents will be contacted up to 3 times, after which they will be considered lost to follow-up. We will also record any episodes of babesiosis, or ehrlichiosis. We will also track the rate of Lyme disease in the towns by passive surveillance from the Mass. Dept. of Public Health. Two independent clinicians blinded to group assignment will review charts.