how many microns is an anthrax spore
- This first sample was probably the New York Post anthrax, though Alibek did not make that clear. The second set of pictures were of the Daschle anthrax. An anthrax spore is about one micron in diameter. Alibek said the Daschle sample had particles ranging from one to fifty microns in size. This size range is typical of powders produced by spray-drying, but not of milled anthrax.