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1 Molecular Biology Unit, Virus Reference Division, Central Public Health Laboratory, Colindale, London NW9 5HT, United Kingdom
2 Legionella Reference Unit, Respiratory and Systematic Infection Laboratory, Central Public Health Laboratory, Colindale, London NW9 5HT, United Kingdom
* Corresponding author. Mailing address: Molecular Biology Unit, Virus Reference Division, Central Public Health Laboratory, Colindale, London NW9 5HT, United Kingdom. Phone: 44 181 200 4400. Fax: 44 181 200 1569. Electronic mail address: jhookey{at}hgmp.mrc.ac.uk.
ABSTRACT
The 16S rRNA-encoding gene sequences from strains of the family Legionellaceae, Sarcobium lyticum, and Coxiella burnetii were determined. Phylogenetic relationships revealed that all Legionella spp. were members of a coherent monophyletic family. The blue-white autofluorescent species formed a defined cluster bounded by Legionella bozemanii and Legionella tucsonensis. The strains of Legionella pneumophila subsp. pneumophila and Legionella pneumophila subsp. fraseri shared 99.2% sequence identity. A legionella-like amoebal pathogen (LLAP-3) showed 99.4% sequence identity to the obligate intracellular bacterial parasite Sarcobium lyticum. A proposal is made for the transfer of Sarcobium lyticum from the genus Sarcobium to the genus Legionella as Legionella lytica comb. nov. On the basis of serology and phenetic and phylogenetic comparisons, the taxa Legionella erythra and Legionella rubrilucens may be regarded as subspecies.
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