Evaluation of different methods to discriminate Bacillus anthracis from other bacteria of the Bacillus cereus group.
OBJECTIVE
To evaluate different methods that are useful for rapid and definitive discrimination of Bacillus anthracis from other bacteria of the Bacillus cereus group in environmental samples like letters claimed to contain anthrax spores.


RESULTS
Characterized strains and bacteria from environmental samples were analysed by microbiological and molecular methods (PCR and restriction analysis). Environmental isolates often shared several microbiological features with B. anthracis, e.g. lack of beta-haemolysis and phospholipase C activity, and only the gamma phage assay was specific for B. anthracis. PCR assays targeting markers from the virulence plasmids exclusively detected B. anthracis, but other PCR targets were also detected in nonanthrax isolates. Additionally, the restriction pattern in an AluI restriction analysis of the SG-749 fragment is not 100% specific. The loci used for multiple-locus variable-number tandem repeat analysis of B. anthracis are also present in other members of the B. cereus group, but amplicon sizes are usually different.


CONCLUSIONS
Environmental samples often contain borderline isolates closely related to B. anthracis both on microbiological and genetic levels. Real-time PCR targeting plasmidal and chromosomal markers should be used for rapid and definitive exclusion of a virulent strain of B. anthracis in such samples.


CONCLUSIONS
This study gives an overview of the current microbiological and molecular methods used for identification of B. anthracis and shows that most assays have limits when borderline isolates present in environmental samples are analysed.
Robert Koch-Institut, Centre for Biological Safety 2, Berlin, Germany. klees@rki.de
S R
SR
Klee
H
H
Nattermann
S
S
Becker
M
M
Urban-Schriefer
T
T
Franz
D
D
Jacob
B
B
Appel
D017103:Bacillus Phages / Q000502:physiology; D001408:Bacillus anthracis / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D001409:Bacillus cereus / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D002876:Chromosomes, Bacterial / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics; D006461:Hemolysis; D018598:Minisatellite Repeats / Q000235:genetics; D016133:Polymerase Chain Reaction; D015183:Restriction Mapping / Q000379:methods
D005819:Genetic Markers