According to the Centre of Disease Control, Anthrax is defined as an acute infectious disease which spreads through spores.
It can stay viable in soil for hundreds of years and the bacteria can infect animals as well as humans. In humans, it is transmitted through the skin, through digestion and through the lungs.
The most recent human infection happened in 2006 in Saskatchewan. The two people infected developed skin infections but made a full recovery. People who are showing signs of contamination can be treated with antibiotics.