Anthrax vaccine refers to a vaccine that provides immunity against anthrax, an infectious disease caused by the bacterium Bacillus anthracis. The vaccine contains a protein extracted from the anthrax bacterium that stimulates the body's defense mechanism to produce antibodies and protect against the disease. Some synonyms for the anthrax vaccine include anthrax immunization, antibacillus anthracis vaccine, and anthrax shot. Other related terms include anthrax prophylaxis, anthrax post-exposure prophylaxis, and anthrax vaccine adsorbed. It is essential to note that vaccination is not a guarantee that a person will not contract the disease, but it reduces the severity of the illness if they do get infected.