How long can C. Tetani survive in soil? _Clostridium tetani_ ( _C. tetani_ ) is a bacterium commonly found in soil and is excreted in the faeces of many animals (both mammals and birds) and serves, by means of the exotoxin, _tetanospasmin_ , causes the life-threatening condition **tetanus**.

Soon after asking this question I found a reliable source, _the National Institutes of Health_. It can survive for over 40 years.