Rapid influenza antigen testing identifies influenza A and B viruses, distinguishing them from other respiratory viruses that cause similar symptoms. Results are available quickly, supporting prompt antiviral treatment when indicated. Sensitivity is lower than molecular (PCR) testing, so negative results in symptomatic patients during flu season may warrant additional testing.
This test is used to evaluate patients with influenza-like illness, particularly during influenza season, to support decisions about antiviral therapy, infection control, and isolation. It is most useful in the first few days of illness when viral load is highest. Sample type is a nasopharyngeal or nasal swab.
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