Growth characteristics of virulent Bacillus anthracis and potential surrogate strains.
The objectives of this study were to compare generation and lag times of virulent Bacillus anthracis strains with those of other Bacillus strains, to identify possible surrogates for growth studies, and to determine if the B. cereus module of the U.S. Department of Agriculture Pathogen Modeling Program (PMP) had predictive value for B. anthracis. Growth characteristics of B. anthracis, B. cereus, B. mycoides, and B. subtilis strains in brain heart infusion broth at pH 6.5, 6.0, and 5.5 were determined by absorbance measurements. Growth curves of B. anthracis Sterne and B. cereus strains appeared similar, and the generation times for strain Sterne fell within the PMP's 95% confidence interval for B. cereus. However, the virulent B. anthracis strains Vollum and Pasteur had shorter generation times than the avirulent Sterne strain and most other surrogates and were lower than the PMP's 95% confidence interval for B. cereus. Growth curves of B. cereus ATCC 9818 and B. subtilis ATCC 6633 were more similar to those of virulent B. anthracis strains, but all potential surrogates had significantly different generation times and lag times under some conditions.
De Siano
Tara
T
Graduate Program in Microbiology and Molecular Genetics, Cook College, the New Jersey Agricultural Experiment Station, Rutgers, The State University of New Jersey, 65 Dudley Road, New Brunswick, New Jersey 08901-8520, USA.
Padhi
Sally
S
Schaffner
Donald W
DW
Montville
Thomas J
TJ
D001407:Bacillus / Q000254:growth & development / Q000472:pathogenicity; D001408:Bacillus anthracis / Q000254:growth & development* / Q000472:pathogenicity; D001409:Bacillus cereus / Q000254:growth & development / Q000472:pathogenicity; D023482:Bioterrorism; D015169:Colony Count, Microbial; D003257:Consumer Product Safety; D005506:Food Contamination / Q000032:analysis; D005516:Food Microbiology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008954:Models, Biological; D011237:Predictive Value of Tests; D014774:Virulence