An article in “Practice Guidelines” entitled “AAP Issues Recommendations on the Prevention and Treatment of Lyme Disease” (June 1, 2000, page 3263) incorrectly referred to Lyme disease as an insect-borne illness. Ticks are arachnids rather than insects. The first sentence of the second paragraph of this item should read as follows: “Lyme disease, a disease transmitted by ticks carrying the spirochete Borrelia burgdorferi, is the most common vector-borne illness in the United States.”