Sofia Influenza A+B FIA

The Sofia Influenza A+B Fluorescent Immunoassay (FIA) uses advanced immunofluorescence-based lateral-flow technology to detect influenza A and influenza B viral nucleoprotein antigens in nasal and nasopharyngeal swab and nasopharygeal aspirate/wash specimens taken directly from symptomatic patients.

The Sofia Influenza A+B FIA involves the disruption of influenza A and B viral antigens. To perform the rapid influenza A and B test, the patient specimen is placed in the Reagent Tube, during which time the virus particles in the specimen are disrupted, exposing internal viral nucleoproteins. After disruption, the specimen is dispensed into the Cassette sample well. From the sample well, the specimen migrates through a test strip containing various unique chemical environments. If influenza A or B viral antigens are present, they will be trapped in a specific location.

Sofia will scan the test strip and measure the immunofluorescent signal by processing the results using method-specific algorithms and display the test results (Positive, Negative, or Invalid) on its display screen. The test results can also be automatically printed on an integrated printer if this option is selected.

Influenza A+B antigen
Fluorescent Immunoassay (FIA)

Nasal swab, Nasopharyngeal swab,
Nasopharyngeal aspirate/wash


Nasal swab 90% / 95%
Nasopharyngeal swab 97% / 95%
Aspirate/wash 99% / 96%

Nasal swab 89% / 96%
Nasopharyngeal swab 90% / 97%
Aspirate/Wash 88% / 96%

Quidel Corporation, USA

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