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Black-legged ticks (also known as deer ticks) feed exclusively on blood. tobyjug5 / Flickr

By Clara Chaisson

In the summer of 2013, I was changing into pajamas when an irritated blotch of skin caught my eye. My rib cage looked like a miniature advertisement for Target: There was a near-perfect circle of red, a smaller, concentric ring of clear skin, and then a red dot right in the middle. Bull's-eye.

In medical jargon this distinctive rash is called erythema migrans, and it's the calling card of Lyme disease. Fittingly enough, I was spending this particular peak tick season in Old Lyme, Connecticut—where it was first discovered in 1975. Luckily, I knew to be on the lookout for this exact symptom, and a course of antibiotics knocked it out of my system. I experienced no further problems.

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