Squirrels are almost never found to have rabies. And squirrels have not been known to cause rabies in humans within the United States. Bites from a squirrel are not normally considered a risk for rabies. Most small rodents and lagomorphs rarely develop rabies; however, woodchucks accounted for 86 percent of rabies cases among rodents reported to the Centers for Disease Control and Prevention (CDC) from 1985 through 1994.
I found that article here.
And if you are anything like me and had to look up what the word "Lagomorph" meant, here it is:
Lagomorph: a member of the mammalian taxonomic order, Lagamorpha, which includes hares, rabbits and pikas. Relative large gnawing animals, distinguished from rodents by having two pairs of upper incisors specialized for gnawing. There are two families, the Leporidai (hares and rabbits), and the Ochotonidae (pikas). The name of the order is derived from the Greek 'lagos' (hare) and "morphē" (form).