tetani "Ch. 20: Tetanus" even tetanus toxoid Clostridium http://www.cdc.gov/vaccines/pubs/pinkbook/tetanus.html "Ch. 20: Tetanus" CDC CDC "Ch. 20: Tetanus" Tetanus CDC www.cdc.gov/vaccines/pubs/pinkbook/tetanus.html CDC 30 cases and 4 deaths per year tetanus http://www.cdc.gov/vaccines/pubs/pinkbook/tetanus.html CDC Clostridium tetani, tetanus toxin Tetanus tetanus www.cdc.gov/vaccines/pubs/pinkbook/tetanus.html www.cdc.gov/vaccines/pubs/pinkbook/tetanus.html CDC 73% of cases Tetanus CDC Small amounts of tetanus toxoid http://www.cdc.gov/vaccines/pubs/pinkbook/tetanus.html#wound CDC tetanus tetanus http://www.cdc.gov/vaccines/pubs/pinkbook/tetanus.html