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. 1979 Jun;9(6):688–692. doi: 10.1128/jcm.9.6.688-692.1979

Rapid diagnosis of influenza A infection by direct immunofluorescence of nasopharyngeal aspirates in adults.

J A Daisy, F S Lief, H M Friedman
PMCID: PMC275380  PMID: 387816

Abstract

The efficacy for direct immunofluorescence of a commercial conjugate for influenza A virus prepared against whole A/Udorn (H3NS) virus was studied. The conjugate was specific for influenza A virus, but its sensitivity varied depending upon the strain of influenza A tested. Nasopharyngeal aspirates collected from 25 patients during an outbreak of influenza were examined for viral antigen with the conjugates and inoculated onto monkey kidney (MK) cells for virus isolation. Fifteen patients had isolates for influenza A/USSR/90/77 (H1N1); nasopharyngeal secretions were fluorescent antibody positive in 12. Fluorescent antibody was copositive with culture in 11/15 patients (73.3%) and conegative in 9/10 (90%). The one fluorescent antibody-positive, culture-negative patient had negative serology for influenza A and the fluorescent antibody result was considered to be a false positive. At a 1:10 dilution, the conjugate stained nasopharyngeal and MK cells infected with A/USSR (H1N1) 2 to 3+, whereas cells infected with H3N2 virus stained 4+. A conjugate made specifically against the ribonucleoprotein antigen, which is universal to all influenza A strains, may improve the sensitivity of the direct immunofluorescent test.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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