Serum samples from 91 patients with acute respiratory infections were studied in different seasons of 1981-1983. The possibility of using the solid-phase radioimmunoassay for the serological diagnosis of influenza A was shown. The use of this technique made it possible to confirm the diagnosis of influenza A (H3N2) in 43.9% of patients under examination, while in the hemagglutination inhibition test influenza was diagnosed only in 18.7% of patients. The radioimmunoassay not only essentially increases the detection rate of influenza, but also ensures the sufficient stability of this characteristic irrespective of the epidemic situation and the character of the group under examination.
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