Ticks latch onto their host while they feed—see this great and horrifying video for specifics. A tick typically needs to be stuck to a host for 36-48 hours in order to pass B. burgdorferi , and since nymphs are harder to see, they are usually attached longer and are more likely to make you sick. Three days to a month after infection, some people get a rash in the shape of a bulls-eye, which can spread up to a foot in diameter. In its early stages, Lyme disease can also cause aches, chills, headache, fatigue, fever, and sore lymph nodes. Later symptoms may include Bell's palsy, which is a loss of muscle tone in the face, as well as arthritis. Some people continue to have fatigue and other symptoms long after they're treated—usually with antibiotics—and some claim these symptoms are evidence of a chronic Lyme illness, although the diagnosis is controversial.