Red lines represent inhibition, green lines enhancement. Tick saliva inhibits T cell proliferation, CD69 expression, and production of IL-2, IL-12, TNF, and IFN-γ by lymphocytes. In contrast, it increases production of IL-4, IL-6, and IL-10. Tick SGE has the same effects as tick saliva and, furthermore, suppresses LFA-1 and VLA-4 expression, proliferation of B cells, and total Ig and IgA production.