Tetanus Vaccination and Aspirin Allergy
There are no contraindications to administering a tetanus (Tdap) shot to patients with aspirin allergy, as aspirin is not a component of any tetanus-containing vaccine. 1, 2, 3, 4, 2
Actual Contraindications to Tdap Administration
The only true contraindications to Tdap vaccination are:
History of anaphylaxis to any vaccine component - Tdap is contraindicated for persons with a history of serious allergic reaction (anaphylaxis) to any component of the vaccine itself, such as tetanus toxoid, diphtheria toxoid, pertussis antigens, aluminum adjuvants, or polysorbate 80. 1, 2, 3, 4, 2
History of encephalopathy within 7 days of pertussis-containing vaccine - Tdap (but not Td) is contraindicated for persons with a history of encephalopathy (coma or prolonged seizures) not attributable to an identifiable cause within 7 days of administration of a vaccine with pertussis components. These persons should receive Td instead of Tdap. 1, 2, 3, 4
Why Aspirin Allergy Is Not Relevant
Aspirin (acetylsalicylic acid) is not a component, excipient, or preservative in any tetanus-containing vaccine formulation (Tdap, Td, or TT). 1, 2, 3, 4
The vaccine components that could potentially cause allergic reactions include tetanus toxoid, diphtheria toxoid, pertussis antigens, aluminum salts (adjuvant), polysorbate 80, and in some formulations, latex (in the syringe tip). 1, 2, 5
Aspirin allergy represents a completely separate immunologic pathway (typically involving cyclooxygenase inhibition or IgE-mediated reactions to aspirin itself) that has no cross-reactivity with vaccine components. 6
Critical Clinical Pearls
Do not delay tetanus vaccination in patients with aspirin allergy, as there is no immunologic or pharmacologic basis for concern. 1, 2, 3, 4
Focus on actual vaccine component allergies when screening patients before Tdap administration, specifically asking about prior reactions to tetanus-containing vaccines, latex allergy (if using Boostrix with latex-containing syringe), or polysorbate allergy. 1, 2, 5
Refer to an allergist only if the patient has a history of anaphylaxis to components included in all Tdap and Td vaccines, to determine whether they have a specific allergy to tetanus toxoid and can be safely desensitized. 1, 2, 3, 4, 2
Common Pitfall to Avoid
- Do not confuse drug allergies (like aspirin) with vaccine component allergies. The only medication-related concern for tetanus vaccination would be a history of anaphylaxis to polysorbate-containing medications, as polysorbate 80 is present in both Boostrix and Adacel formulations. 5