Sources:
1. National Foundation for Infectious Diseases. Facts about tetanus for adults. Available at: http://www.nfid.org/pdf/factsheets/tetanusadult.pdf Accessed August 7, 2009.
2. US National Library of Medicine and National Institutes of Health. Tetanus. Medline Plus Medical Encyclopedia Web site. Available at: http://www.nlm.nih.gov/medlineplus/ency/article/000615.htm. Accessed March 21, 2005.