Study presents a preliminary analysis of the diagnostic effectiveness of the common respiratory viruses detection in the nasal and throat swab samples by the indirect immunofluorescence test. Samples referred for diagnostic test from 15 consecutive patients were examined. All evaluated throat swab samples proved positive (100%), while the rate of respiratory viruses detection in nasal samples was as low as 13.3%. Thus, our preliminary though quite informative data demonstrate considerably higher sensitivity of throat samples in IF-based diagnosis of respiratory viral infection.