VEGFA and bartonellosis: Of 19 patients (76%) with a history of Bartonella exposure, 15/19 improved (79%), and among 8 patients with proof of active Bartonella infection, i.e., PCR positive, FISH positive, and/or elevated vascular endothelial growth factor (VEGF), 3/8 (38%) remained in remission, with two out of four who were Bartonella FISH positive going into remission (50%).