Thanks for this info. Gram negative or gram positive is a means of identifying bacteria. Anthrax is gram positive meaning when dyed it shows a positive image. Microbiology is not my strong suit I realy on Mrs Harpseal's knowledge there. A gram negative anthrax would be a designer bug in her opinion.
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A gram negative anthrax would be an impossibility. The gram stain procedure is designed to differentiate the exposed peptidoglycans in the cell membrane. A gram positive organism has exposed peptidoglycans, whereas a gram negative organism does not.
This defining cell wall characteristic is inherent to the organism, and defines it's metabolic characteristics as well. If the organism is gram negative, then it is not bacillus anthracis.
Anthrax is also a comparatively large organism (among the largest) and is distinctive in this way as well.