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T h e n e w e ng l a n d j o u r na l o f m e dic i n e Current Concepts Henry M. Feder, Jr., M.D., Barbara J.B. Johnson, Ph.D., Susan O’Connell, M.D., Eugene D. Shapiro, M.D., Allen C. Steere, M.D., Gary P. Wormser, M.D., and the Ad Hoc International Lyme Disease Group*From the Departments of Family Medi-cine and Pediatrics, Connecticut Chil-L B. bur yme disease, the most common ti