Expression of receptors on peripheral blood mononuclears of donors and patients with viral infections during therapy was studied using FITC-labeled monoclonal antiidiotypical antibodies with the "internal image" of human alpha- and gamma-interferons and monoclonal antibodies to these interferons. Activation of the immune system caused by infection modifies the expression of interferon receptors and leads to appearance of membrane-bound interferons, mainly gamma-interferon.

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