Clostridium tetani
Tetanus is caused by the tetanus bacterium "Clostridium tetani". Tetanus is an international health problem, as "C. tetani" endospores are ubiquitous. Endospores can be introduced into the body through a puncture wound (penetrating trauma). Due to "C. tetani" being an anaerobic bacterium, it and its endospores thrive in environments that lack oxygen, such as a puncture wound. With the changes in oxygen levels, the drum stick-shaped endospore can result in quick spread.