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Ticks And Lyme Disease: 3 Factors Determine Risk Of Infection

The chance of catching Lyme disease from an individual tick ranges from zero to roughly 50 percent. Three factors matter: the tick species, where it came from and how long the tick was feeding.
A blacklegged tick like this one can be hard to spot.

So you've found a tick, and it's sucking your blood.

After an initial wave of revulsion, you carefully remove it with a pair of tweezers. Now you're probably wondering: What's the chance I have Lyme disease?

Nick Berndt found himself in that exact situation earlier this summer. Berndt, 26, of Lancaster, Pa., felt a tick attached to his scalp three days after disc golfing in a forest near his home.

"Obviously, Lyme disease was my main concern with it," Berndt says. "It's

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