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  • Title: A pseudoepidemic of Legionella infections.
    Author: Ristagno RL, Saravolatz LD.
    Journal: Chest; 1985 Sep; 88(3):466-7. PubMed ID: 3896681.
    Abstract:
    During a six-month period, we observed an increase in the incidence of presumed Legionnaires' disease (LD) due to false-positive direct immunofluorescent antibody (DFA) staining. Contamination of the DFA staining reagents with Legionella appeared to account for our pseudoepidemic. Although a positive DFA stain has been regarded as highly specific for the diagnosis of LD, the clinician must interpret such results with caution.
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