UNITED KINGDOM - NOVEMBER 07: Tetanus, or 'lockjaw', is the result of a neurotoxin produced by the widespread bacterium �clostridium tetani� when it is allowed to multiply in conditions where there is little or no oxygen, such as in deep puncture wounds. The tetanus vaccine is a form of active immunisation, meaning that the body is stimulated to produce its own defences, in the form of antibodies or, in this case, antitoxin. (Photo by SSPL/Getty Images)
