I am in the medical biz and I can give you some info on ticks and Lyme's disease.
YES, there is Lyme's around here and it is actually very common in PA, MD, and northeastern states. The tick that carries Lymes is NOT the dog tick that you can actually see, it is the Deer tick which is very very small. Dog ticks are typically about the size of a match head and have the characteristic white patch on the back. The deer tick is roughly 1/4 the size of a dog tick.
Ticks actually have to stay attached 24 hours or more to transmit Lyme's disease, ANYTHING LESS THAN 24HRS AND YOU ARE OK. If the bite of the tick flares do not be alarmed, the characteristic "bull's eye" rash of Lymes only occurs in roughly 20%, typically a week after the bite. The rash that typically accompanies most insect bites is merely cellulitis, which is a superficial infection of the skin and it is easily treated. Cellulitis is characterized by an area that swells rapidly, is painful, itches, becomes red and warm to the touch. As for Lyme's treatment typically someone who displays a reaction from a tick bite will get either a single dose of Doxycycline or a 14-21 day course depending on what symptoms they present with.
As for other things that you can get from ticks in this area. You can get Rocky Moutain Spotted Fever, although it is very rare. The name Rocky Mountain Spotted Fever is actually a misnomer because the southeastern states, especially the Carolinas and VA are common places to get RMSF and it is rare in the western states. RMSF presents with a rash that appears as spots on your palms and the souls of your feet and the rash typically causes the skin to shed on your hands, also you will have a fever and muscle aches.
You can also get a disease called Babesiosis from tick bites in this area, almost entirely on the coastal regions of New England states (Nantucket and MV especially) and New Jersey's coastal areas. This disease is easily treated but can cause a disorder that is similar to a mild malarial infection.
AND FOR ALL YOU RABBIT HUNTERS OUT THERE, you can get a disease called Tularemia, from a bacteria that is carried by rabbits. If you have recently bagged a few rabbits and become ill a few days after gutting them, you should head to the doctor.