<prompt> A full course of immunization with 3 doses of tetanus toxoid, confers immunity for how many years?5101520  <response>: b. 10Ref: ZAP 157, Nelsons 20e p 1255 Ghai 8e p 196-197In individuals who have completed primary booster vaccination with DTP, TT boosters every 10 yrs provide sufficient protection. 