I would like to know how Blackleg gets in the soil. Is it from animals that have previous died from the desease? I recently found a dead calf in my pasture that was too decade to determine cause of death, but was born 2-23-10, weighed approx. 500-550#. Very heathly bull calf last week! Will his carcass contaminate the soil for future cattle to come in contact with, if this was the cause of death?