From Dr Horowitz 'Tick-borne co-infections play an important role in keeping patients chronically ill with Lyme-MSIDS. Bartonella, or "cat scratch" disease, is one of the co-infections responsible for resistant neurological symptoms. Bartonella is described in detail in chapter four of my book "Why Can't I Get Better? Solving the Mystery of Lyme and Chronic Disease," under Lyme and Common Tick-Borne Bacterial Infections.'