A common point of view among infectious theories at an early stage is that a pathogen is recognized as an antigen-presenting cell (APC), with factors such as tumor necrosis factor (TNF) α, interleukin (IL)-6, vascular endothelial growth factor (VEGF) (9) produced by macrophage and T cells, etc. activated by macrophages causing vasculitis, leading to the formation of the pathology (Figure 1A). This evidence concerns the gene VEGFA and vasculitis.