Immunologic response to tetanus toxoid in geriatric patients

Area of Science:

• Geriatric Medicine
• Immunology
• Vaccinology

Background:

• Inadequate tetanus antibody levels are prevalent in over 50% of individuals aged 65 and older.
• Despite immunization recommendations for this demographic, efficacy data remains limited.

Purpose of the Study:

• To evaluate the effectiveness of a single tetanus toxoid immunization in geriatric patients lacking protective antibody titers.

Main Methods:

• Thirty-five geriatric patients (>65 years) with low tetanus antibody titers received one tetanus toxoid immunization.
• Tetanus antibody levels were reassessed using enzyme-linked immunosorbent assay at least two months post-immunization.
• Protective tetanus antibody levels were defined as greater than 0.17 IU/mL.

Main Results:

• 86% (30/35) of geriatric patients achieved protective tetanus antibody titers after a single immunization.
• Mean antibody titers increased significantly from 0.1 IU/mL pre-immunization to 0.61 IU/mL post-immunization.
• No correlation was found between seroconversion and patient age, sex, medical history, or time since immunization.

Conclusions:

• A single tetanus toxoid injection is effective in conferring protective immunity in a majority of geriatric patients.
• This immunization strategy addresses inadequate tetanus antibody levels in the elderly population.