Correct Answer: A [Bacteria]

Notes: Tetanus, once considered nearly eradicated, is resurging in the United States. Tetanus is a serious bacterial infection that affects the nervous system and is also known as lockjaw. The bacteria usually enter the body through open wounds or cuts. Tetanus bacteria are commonly found in soil, manure, and the human intestine. The disease is not transmitted from person to person. There is no cure for tetanus; treatment mainly focuses on managing symptoms and complications. Recovery from tetanus does not provide natural immunity, so a person can be infected again. Tetanus is completely preventable through vaccination.