| Legionella bozemanii | A species that causes human pneumonia. (05 Mar 2000) |
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| Legionella | <bacteria> Genus of gram-negative asporogenous bacteria. most species are pathogenic in humans, causing pneumonia like disease, for example Legionnaire's disease, named after an outbreak in Philadelphia amongst members of an American Legion reunion. (27 Sep 1997) |
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| Legionella dumoffii | A species implicated in pneumonia. (05 Mar 2000) |
| Legionella feeleii | A species implicated in pneumonia. (05 Mar 2000) |
| Legionella gormanii | A species implicated in pneumonia. (05 Mar 2000) |
| Legionella longbeachae | A species implicated in pneumonia. (05 Mar 2000) |
| Legionella micdadei | A species that causes Pittsburgh pneumonia, a variant of Legionnaires' disease. Accounts for approximately 60% of Legionella pneumonias other than those caused by Legionella pneumophila. Synonym: Pittsburgh pneumonia agent. (05 Mar 2000) |
| legionella pneumophila | A species of gram-negative, aerobic bacteria that is the causative agent of legionnaires' disease. It has been isolated from numerous environmental sites as well as from human lung tissue, respiratory secretions, and blood. (12 Dec 1998) |
| Legionella wadsworthii | A species implicated in pneumonia. (05 Mar 2000) |