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, 11 (8), 1211-7

Coxiella Burnetii Genotyping


Coxiella Burnetii Genotyping

Olga Glazunova et al. Emerg Infect Dis.


Coxiella burnetii is a strict intracellular bacterium with potential as a bioterrorism agent. To characterize different isolates of C. burnetii at the molecular level, we performed multispacer sequence typing (MST). MST is based on intergenic region sequencing. These regions are potentially variable since they are subject to lower selection pressure than the adjacent genes. We screened 68 spacers in 14 isolates and selected the 10 that exhibited the most variation. These spacers were then tested in 159 additional isolates obtained from different geographic areas or different hosts or were implicated in different manifestations of human disease caused by C. burnetii. The sequence analysis yielded 30 different allelic combinations. Phylogenic analysis showed 3 major clusters. MST allows easy comparison and exchange of results obtained in different laboratories and could be a useful tool for identifying bacterial strains.


Dendrogram of the genetic relatedness among the 30 different sequence types defined by multispacer sequence type (MST) analysis. The dendrogram was constructed by unweighted pair-group method with arithmetic mean. Plasmid sequence type, com1 group, and djlA group corresponding to each ST are indicated on the right of the figure. The 3 monophyletic groups defined by MST analysis are indicated on the left.

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