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Techniques to analyze the host immune response elicited by the presence of oral microorganisms and their products are central to our understanding of the local and systemic effects of oral diseases. This immune response has been extensively investigated for periodontal disease. The local response may result in lesions involving the gingival tissues and depending upon host susceptibility and microbial virulence may lead to local tissue destruction. More recently, however, the importance of the systemic inflammatory and immune response to oral organisms has been recognized. These systemic responses have been associated with an increased risk for cardiovascular disease, diabetes, and preterm low birth weight. A number of techniques are used extensively by researchers investigating humoral and cellular immune responses to oral organisms both in local oral tissues and fluids and systemically in peripheral blood. These are enzyme-linked immunosorbent assay (ELISA) to quantify specific antibody and cytokines in serum, gingival crevicular fluid (GCF), and saliva; characterization of T cells from peripheral blood and gingival tissues using flow cytometry; and immunohistological analysis of the inflammatory cell infiltrate in gingival tissues.