General Information, Microbiology

Microbiology: Organism Taxonomy Updates

To remain up to date with the scientific literature, microbiology must periodically update the official taxonomic nomenclature for organisms as published in the International Journal of Systematic and Evolutionary Microbiology (IJSEM). These updates also satisfy the laboratory’s accreditation checklist item MIC.11375 from the College of American Pathologists (CAP). Current organism classification is typically revised based on genetic relatedness among genera and species, as opposed to historical phenotypic biochemical characteristic studies.

Old Name New Name Epic Name
Clostridium difficile Clostridioides difficile Clostridioides (Clostridium) difficile
Enterobacter aerogenes Klebsiella aerogenes Klebsiella (Enterobacter) aerogenes
Propionibacterium acnes

Propionibacterium avidum

Propionibacterium granulosum

Cutibacterium acnes

Cutibacterium avidum

Cutibacterium granulosum

Cutibacterium (Propionibacterium) acnes

Cutibacterium (Propionibacterium) avidum

Cutibacterium (Propionibacterium) granulosum

When identified in culture, these organisms will be reported in Epic using the former name in parentheses to aid in recognition, i.e. Klebsiella (Enterobacter) aerogenes.

Clostridioides” will be displayed within toxin EIA and PCR orders for detection of this organism from stool. Fortunately, the colloquial use of the phrase “C. diff” remains accurate.

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