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Legionella wadsworthii Species Nova: A Cause of Human Pneumonia

PAUL H. EDELSTEIN, M.D.; DON J. BRENNER, Ph.D.; C. WAYNE MOSS, Ph.D.; ARNOLD G. STEIGERWALT, B.S.; ELAINE M. FRANCIS, M.D.; and W. LANCE GEORGE, M.D.
[+] Article and Author Information

Grant support: the Medical Research Service of the Veterans Administration.

▸Requests for reprints should be addressed to Paul H. Edelstein, M.D.; Infectious Disease Section (111F2); Veterans Administration Wadsworth Medical Center; Wilshire and Sawtelle Boulevards; Los Angeles, CA 90073.


Los Angeles, California; and Atlanta, Georgia


© 1982 American College of PhysiciansAmerican College of Physicians


Ann Intern Med. 1982;97(6):809-813. doi:10.7326/0003-4819-97-6-809
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A new species of Legionella that caused pneumonia in a patient with chronic lymphocytic leukemia has been characterized. The name Legionella wadsworthii species nova is proposed for this bacterium. The type strain is Wadsworth 81-716A (American Type Culture Collection 33877). The new species differs phenotypically from L. pneumophila in that the predominant cellular fatty acid is methyl-12-methyltetradecanoic acid (a-15:0) rather than methyl-14-methylpentadecanoic acid (i-16:0), and in its failure to react with L. pneumophila antiserum. The clinical illness caused by L. wadsworthii was not apparently different from that seen with other legionella infections, except for prolonged fever and slow resolution of pulmonary infiltrates.

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