Volume 28, Number 9—September 2022
Laboratory Misidentifications Resulting from Taxonomic Changes to Bacillus cereus Group Species, 2018–2022
|GTDB species name||Encompasses strains which:
|Can cause anthrax illness||Can cause emetic illness||Cannot cause anthrax or emetic illness|
||Encompasses all anthrax-causing B. anthracis strains, some anthrax-causing B. cereus strains, and many B. cereus strains that are incapable of causing anthrax illness but are commonly isolated from environmental and food sources (6,7).
||Encompasses all cereulide-producing B. cereus strains known colloquially as emetic B. cereus, including the high-risk ST26 lineage; also encompasses many environmental and food isolates that are incapable of causing emetic illness (7,11).
|B. tropicus||Yes||No||Yes||Encompasses some anthrax-causing B. cereus strains, as well as B. cereus strains that are incapable of causing anthrax illness (6,7).|
*Obtained using GTDB Releases R95 and R202, but is applicable to any taxonomic framework, in which species names are assigned relative to B. cereus group species type strain genomes, e.g., by a species threshold of 95–96 average nucleotide identity or species threshold of 70% in silico DNA-DNA hybridization (7). GTDB, Genome Taxonomy Database; ST, sequence type assigned using the PubMLST 7-gene multilocus sequence typing scheme for B. cereus (https://pubmlst.org). †B. anthracis and B. cereus refer to historical and/or colloquial species definitions assigned using traditional microbiological methods, as outlined in the US Food and Drug Administration’s Bacteriological Analytical Manual (5).
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