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Confirmation of Legionella pneumophila cultures with a fluorescein-labeled monoclonal antibody

We compared a fluorescein-labeled monoclonal antibody directed against an outer membrane protein of Legionella pneumophila (Genetic Systems Corp. [GSC], Seattle, Wash.) with a similarly labeled polyclonal reagent (L. pneumophila serogroups 1 to 6, poly; BioDx, Inc., Denville, N.J.) for the confirmation of L. pneumophila isolates grown in culture. Duplicate suspensions of 52 organisms, including 21 L. pneumophila and 8 non-L. pneumophila species of legionella, were placed on individual glass slides, fixed, and stained with both reagents, and the results were compared. Both antisera correctly identified all L. pneumophila serogroups 1 to 6, but only the GSC reagent produced definitive staining of the L. pneumophila isolates of serogroups 7, 8, and 9. Additionally, the GSC reagent produced more uniform staining patterns around the legionella bacilli and displayed little background fluorescence when compared with the BioDx reagent.