Bartonella is considered a co-infection of Lyme.

"One of our board members, Michelle, had the privilege to accompany her husband, a local veterinarian, to listen to a lecture by Dr. Ed Breitschwerdt. Dr. Breitschwerdt is not only a doctor of veterinary medicine but also an expert on infectious diseases particularly Bartonella."

 

 http://www.kentuckyindianalymesupport.org/2013/07/01/a-bartonella-guru-speaks-out/