| typing methods for the plague pathogen, yersinia pestis. | phenotypic and genotypic methodologies have been used to differentiate the etiological agent of plague, yersinia pestis. historically, phenotypic methods were used to place isolates into one of three biovars based on nitrate reduction and glycerol fermentation. classification of y. pestis into genetic subtypes is problematic due to the relative monomorphic nature of the pathogen. resolution into groups is dependent on the number and types of loci used in the analysis. the last 5-10 years of rese ... | 2009 | 19714987 |