A system of diagnostic tests (complement enzyme assay) is developed, detecting viral and other antigens, toxins, antibodies, and specific immune complexes in liquid enzyme immunoassay based on the complement fixation test. The system is simple and economic, the results can be transferred into digital data, and the above factors can be detected individually in biological materials from patients. The system is effective, and in many cases (for example, in the diagnosis of enteroviral diseases) is the only method for rapid isolation and typing of the infection agents.
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