How this decision is made
Tetanus prophylaxis after a wound depends on two things: how contaminated/high-risk the wound is, and how complete the patient's tetanus vaccination history is. This tool follows the standard ACIP/WHO wound-management decision table used in emergency and outpatient settings worldwide.
Wound-management decision table
| Prior doses | Clean, minor wound | All other wounds |
|---|---|---|
| Unknown or <3 doses | Td/Tdap: Yes · TIG: No | Td/Tdap: Yes · TIG: Yes |
| ≥3 doses | Td/Tdap: only if >10 years since last dose · TIG: No | Td/Tdap: only if >5 years since last dose · TIG: No |
Tdap (tetanus-diphtheria-acellular pertussis) is generally preferred over plain Td for a patient's first dose in this scenario, or if they have never received Tdap, to also update pertussis immunity. Tetanus immunoglobulin (TIG), when indicated, is given as 250 IU IM at a site different from the vaccine.
Clinical use
- "All other wounds" includes wounds contaminated with dirt, faeces, or saliva; puncture wounds; avulsions; and wounds from missiles, crushing, burns, or frostbite — anything that isn't a clean, minor wound.
- Unknown vaccination history is treated as incomplete — when in doubt, vaccinate; a Td/Tdap dose given to an already-immune patient carries minimal risk, while withholding it from a susceptible patient carries a real one.
- TIG is never needed for patients with a completed primary series, regardless of wound type or time since last dose, since their own immune system can mount an adequate response.
- This is a wound-management decision, not a full immunization schedule — patients starting or completing a primary series still need the remaining scheduled doses in addition to whatever is indicated for the acute wound.
Frequently asked questions
What counts as a "clean, minor" wound?
A wound that is not contaminated with dirt, faeces, or saliva, is not a puncture, avulsion, or crush injury, and is not caused by a missile, burn, or frostbite. Anything outside that description is treated as "all other wounds" for tetanus prophylaxis purposes.
Do I need the tetanus vaccine if I've already had 3 or more doses?
Only if it's been more than 10 years since your last dose (for a clean, minor wound) or more than 5 years (for any other wound). Otherwise, no additional dose is needed for that specific wound.
When is tetanus immunoglobulin (TIG) needed?
Only for wounds that are not clean and minor, in patients whose prior tetanus vaccination is unknown or incomplete (fewer than 3 documented doses). Patients with a completed primary series never need TIG, regardless of wound type.
Is Tdap the same as the tetanus shot?
Tdap also covers diphtheria and pertussis in addition to tetanus, and is generally preferred over plain Td when a patient needs a dose in the wound-management setting, particularly if they've never received a Tdap dose before.
References
- Advisory Committee on Immunization Practices (ACIP). Updated Recommendations for Use of Tetanus Toxoid, Reduced Diphtheria Toxoid, and Acellular Pertussis Vaccine — Wound Management. MMWR. 2006/2013 updates.
- World Health Organization. WHO position paper on tetanus vaccines. Wkly Epidemiol Rec. 2017;92(6):53–76.
- Centers for Disease Control and Prevention. Tetanus — Wound Management Guidance.