How old is Lyme disease? National Geographic: 5,000 years old

Maybe Lyme disease was around a long time before Plum Island. That is the position of National Geographic:

http://ngm.nationalgeographic.com/2011/11/iceman-autopsy/hall-text

This is a fascinating story; perhaps Lyme-related infections have been pestering humanity for thousands of years, and may even be responsible for many of the health problems of our ancestors.