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Is the toxoid injection single dose?

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No, tetanus toxoid (TT) is not a single-dose injection. Here is the complete schedule:

Tetanus Toxoid - Dosing Schedule

Primary Immunization (for non-immune adults)

  • 2 doses of Tetanus Toxoid Adsorbed (0.5 mL each, IM into the arm)
  • Given at an interval of 1-2 months apart
  • Longer intervals between doses = better immune response

Booster Doses

  • 1st booster (3rd dose total): 1 year after the first two doses
  • 2nd booster (4th dose total): 5 years after the 3rd dose
  • In developing countries, up to 4 doses total are recommended for adults including pregnant women
  • Frequent/excess boosters should be avoided

In Wound Management

  • If a patient has had 3 or more prior doses, a booster is given only if:
    • >10 years since last dose (clean, minor wound)
    • >5 years since last dose (dirty/tetanus-prone wound)

Key Points

  • Purified Tetanus Toxoid (Adsorbed) is preferred over plain toxoid - gives higher and longer-lasting immunity
  • The plain (fluid) toxoid may be used as a rapid booster when quick protection is needed
  • Stored at 2-8°C and must NOT be frozen
So while a single booster dose is sometimes given in wound-management situations to already-immunized individuals, the full primary course requires at least 2 doses, followed by booster doses for lasting protection.
  • Park's Textbook of Preventive and Social Medicine, Monovalent Vaccines section
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