Anthrax is a serious infectious disease caused by Bacillus anthracis, a bacterium that forms spores. Anthrax most commonly occurs in wild and domestic animals such as cattle, sheep, goats, camels, antelopes, but it can also occur in humans when they are exposed to infected animals or to tissue from infected animals or when anthrax spores are used as a bioterrorist weapon. Anthrax is not known to spread from one person to another.

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