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Study sites and timeline. Nine cohorts of adult and nymphal Ixodes scapularis ticks were collected from four study sites in New York State, USA (top), during their host-questing seasons in a period of 18 months (bottom). Nymphal samples are colored in red and adult samples in blue. Numbers in parenthesis indicate the numbers of ticks infected by Lyme disease spirochetes (numerator) and the total sample size (denominator).
