Abstract
Immunological interactions at the tick–host interface involve innate and specific acquired host immune defenses and immunomodulatory countermeasures by the tick. Tick feeding stimulates host immune response pathways involving antigen-presenting cells, cytokines, B-cells, T-cells, circulating and homocytotropic antibodies, granulocytes, and an array of biologically active molecules. In response to host immune defenses, tick-mediated host immunosuppressive countermeasures inhibit: host antibody responses; complement activation; T-cell proliferation; and cytokine elaboration by macrophages and Th1-lymphocytes. Immunosuppressive proteins identified in tick salivary glands and saliva have been partially characterised. Tick-induced host immunosuppression facilitates blood meal acquisition and is an important factor in the transmission/establishment of the tick-borne disease-causing agent, Borrelia burgdorferi. A novel strategy for control of tick-borne pathogens is proposed.
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