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This undated photo provided by the U.S. Centers for Disease Control and Prevention (CDC) shows a blacklegged tick — also known as a deer tick. Diagnosing if a tick bite caused Lyme or something else can be difficult but scientists are developing a new way to catch the disease early, using a "signature" of molecules in patients' blood. (CDC via AP) ** FILE **

This undated photo provided by the U.S. Centers for Disease Control and Prevention (CDC) shows a blacklegged tick — also known as a deer tick. Diagnosing if a tick bite caused Lyme or something else can be difficult but scientists are developing a new way to catch the disease early, using a "signature" of molecules in patients' blood. (CDC via AP) ** FILE **

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