A simple disc technique for the presumptive identification ofLegionella pneumophila

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Abstract
A method is described for the presumptive identification of Legionella pneumophila by the formation of satellite colonies around filter paper discs impregnated with ferric pyrophosphate and L-cysteine hydrochloride on a deficient basal medium. This technique simplifies the differentiation of picked colonies of L pneumophila from other organisms in mixed cultures from environmental and contaminated clinical samples.