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Int J Syst Evol Microbiol. 2019 Aug 28. doi: 10.1099/ijsem.0.003667. [Epub ahead of print]

Apibacter muscae sp. nov., a novel bacterial species isolated from house flies.

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Leuven Institute for BeerResearch (LIBR), Gaston Geenslaan 1, 3001 Leuven, Belgium.
CMPG Laboratory of Genetics andGenomics, Department M2S, KU Leuven, Gaston Geenslaan 1, 3001 Leuven, Belgium.
VIB - KU Leuven Center for Microbiology, Gaston Geenslaan 1, 3001 Leuven, Belgium.
Biology Department, School of Science, College of Science and Technology, University of Rwanda, Kigali, Rwanda.
Laboratory for ProcessMicrobial Ecology and Bioinspirational Management (PME&BIM), DepartmentM2S, KU Leuven, Campus De Nayer, Fortsesteenweg30A, 2860 Sint-Katelijne Waver, Belgium.


We describe the isolation and characterization of three bacterial isolates from the common house fly, Musca domestica, caught in Londerzeel, Belgium and Huye District, Rwanda. Although isolated from distinct geographical locations, the strains show >99 % identical 16S rRNA gene sequences and are <95 % identical to type strains of Apibacter species. Whole-genome sequences were obtained for all three strains. The genomes are 2.4-2.5 Mb with a G+C content of ~30.3 mol%. Bacteriological and biochemical analysis of the strains demonstrate distinctly different characteristics compared to known Apibacter species. Particularly, the three strains investigated in this study can be distinguished from the known Apibacter species (Apibacter mensalisand Apibacter adventoris) through urease and β-glucosidase activities. Whole-cell fatty acid methyl ester analysis shows that the fatty acid composition of the novel strains is also unique. On the basis of phylogenetic, genotypic and phenotypic data, we propose to classify these isolates as representatives of a novel species of the genus Apibacter, Apibacter muscae sp. nov., in reference to its prevalence in house flies, with strain G8T (=LMG 30898T=DSM 107922T) as the type strain.


Apibacter; Musca domestica; house fly; polyphasic taxonomy


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