Lyme disease is emblematic of the threat ticks pose in a warming world. It is caused by deer ticks carrying the bacteria Borrelia burgdorferi. Lyme was discovered in Connecticut in the mid-1970s. Today it is a major, and growing, health threat. According to the CDC, reported cases in the US have tripled since the late nineties. Lyme disease has become an almost “unparalleled threat to regular American life,” as Bennett Nemser, an epidemiologist who manages the Cohen Lyme & Tickborne Disease Initiative at the Steven & Alexandra Cohen Foundation, has said. “Really anyone—regardless of age,
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