The TRUE statement regarding tetanus is:
Tetanus is prevented by Active and passive immunization. Active immunization is with tetanus toxoid and passive immunization is with human tetanus hyperimmunoglobulin. Simultaneous active and passive immunization is given in non immune persons. The purpose of antitoxin is for immediate protection and the purpose of toxoid is for long lasting protection. Life long immunity is not achieved by tetanus immunization and a booster every 10 years is required. Ref: Park's Textbook of Preventive and Social Medicine By K. Park, 18th Edition, Pages 248-52
Five dose immunisation provides life long immunity
TT affords no protection in the present injury
TT serves no use once 12 hours have elapsed following injury
TT and Ig may both be given in suspected tetanus