Just 220 pounds of powdered anthrax material, seeded into the air of a city, could kill more than 1 million people, one study estimated. Iraq, North Korea, Russia, and other countries can deliver anthrax in artillery shells, bombs, and missiles. U.S. military forces are being vaccinated against anthrax. Terrorist threats involving anthrax have occurred in the United States and elsewhere. More than 70 Russians died in a 1979 anthrax-release accident at a germ warfare production facility.
Anthrax is an international concern because it reproduces oddly.
A gamete from one parent combines with a gamete from the other to form a new individual. That's sexual reproduction. These tiny ball-like structures consist of an outer wall surrounding a nucleus and other cell material. A spore can grow into a new individual without uniting with another reproductive cell. Some have alternate cycles of sexual and asexual reproduction.