<prompt> All of the following statements rearding Clostridium tetani are true, except -Spores are resistant to heatPrimary immunization consists of three dosesIncubation period is 6-10 daysNone  <response>: Ans. is None Tetanus is not transmitted from person to person. The primary series of active immunization for adults consists of three doses. The first and second dose are given 4-8 weeks apa and the third dose is given 6-12 months after the second. Thereafter a booster dose is requires every 10 years. Activecombined Active monovalent vaccines 1st dose - 6th week DPT 2nd dose - 10th week DPT 3rd dose - 14th week DPT 1st booster - 18th month DPT 2nd booster 5th completed year DT 3rd booster - 10th year TT 4th booster - 16th years TT Purified tetanus Toxoid adsorbed supplanted the plain Toxoid, having 3 doses Each 0.5 ml , injected into arm given at intervals of 0,2,12 months. The longer the interval bw two doses, better is the immune response. Booster doses : After 5 yr fb Every 10 yrs 