Lyme Borreliosis Medical Profile Borrelia burgdorferi is a fastidious microaerophilic spirochete, the causative bacterium for Lyme borreliosis. Three groups of Borrelia organisms have been cultured. They are collectively called Borrelia burgdorferi sensu lato. Group 1 (B. burgdorferi sensu stricta) is found in North America; Group 2 (B.garini) and Group 3 (B. afzeldi) are found in … Continue reading Lyme Disease Review