It's the puncture that's the key, not the nail. Clostridium tetani spores are ubiquitous in the soil and become capable of tetanus once they're in an anaerobic

It's the puncture that's the key, not the nail. Clostridium tetani spores are ubiquitous in the soil and become capable of tetanus once they're in an anaerobic environment - and about 98% of oxygen in blood is bound to hemoglobin.