Charcoal-yeast extract agar slant cultures of Legionella representing all four named species were stored at room temperature in the dark. Some L. pneumophila strains survived 2 months, L. bozemanii and L. dumoffii strains were viable at 4 months, and L. micdadei strains remained viable after 1 year in storage.
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G A Hébert (1980) studied this question.