2 Answers

What Is Anthrax?
Anthrax is a serious disease caused by Bacillus anthracis, a bacterium that forms spores. A bacterium is a very small organism made up of one cell. Many bacteria can cause disease. A spore is a cell that is dormant (asleep) but may come to life with the right conditions.

There are three types of anthrax:

skin (cutaneous)
lungs (inhalation)
digestive (gastrointestinal)

Read more >http://www.bt.cdc.gov/agent/anthrax/needtoknow.asp

Anthrax vaccines are vaccines against the infectious disease anthrax. Anthrax is caused by the spore-forming bacterium Bacillus anthracis, that most commonly occurs in wild and domestic mammals.[1][2] Anthrax also occurs in humans when they are exposed to infected animals, hides, or tissue from infected animals, or when they are directly exposed to B. anthracis. Depending on the route of infection, anthrax disease can occur in three forms: cutaneous, inhalational, and rarely, gastrointestinal.