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Buffered charcoal-yeast extract (BCYE) agar is the selective medium required for recovery of Legionella species, especially Legionella pneumophila, from respiratory secretions; other common respiratory pathogens such as Haemophilus influenzae, Moraxella catarrhalis, or Burkholderia cepacia do not grow on this medium [Feeley et al., 1979, PMID 393713].