Sources:
1. Pascual FB, McGinley EL, Zanardi LR, Cortese MM, Murphy TV. Tetanus surveillance—United States, 1998-2000. In: Surveillance Summaries, June 20, 2003. MMWR. 2003;52(SS-3):1-8.
2. National Foundation for Infectious Diseases. Facts about tetanus for adults. Available at: http://www.nfid.org/factsheets/tetanusadult.html. Accessed March 21, 2005.