The bacterium bacillus anthracis, which causes anthrax, has been developed as a biological warfare agent.

This statement above is TRUE.
Anthrax is an infection that is caused by the bacteria Bacillus anthracis. The infection is spread by contact with the spores of the bacteria. The bacteria affect the respiratory system and cause the lungs to collapse leading to death.
Some countries have developed anthrax as a weapon of war.