Lyme disease is caused by a bacteria transmitted to humans through tick bites. Left untreated, it can lead to heart problems, neurological symptoms or arthritis. Most reported cases are concentrated in the coastal Northeast and mid-Atlantic, as well as Wisconsin, Minnesota and Northern California, but the disease has been reported in nearly every state. Outbreaks tend to occur in summer and early fall.
Deer ticks are so small that they can be difficult to see, so you may not realize you've been bitten. The telltale sign of infection is a red expanding rash (usually at the location of the bite) that swells to form a circular or oval shape, like a bull's eye. This rash can show up three to 30 days after transmission and is usually not painful or itchy. Other signs may include fever, headache, muscle and joint pain, stiff neck, sore throat, fatigue and changes in vision. Treatment usually involves a three week course of antibiotics which often provides a full cure.
Although many ticks don't carry Lyme disease, bites should be monitored. Carefully remove the tick. Your chances of contracting Lyme disease are greatly reduced if you remove the tick within 24 hours. Studies show that transmission does not occur until 36 to 48 hours after the tick attaches to your body. If symptoms occur, see your doctor immediately.
~Centers for Disease Control