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Related Experiment Videos

Hepatitis A vaccines and the elderly.

Blaise Genton1, Valérie D'Acremont, Hans-Jacob Furrer

  • 1Travel Clinic, Medical Outpatient Clinic, University of Lausanne, Rue du Bugnon 44, 1011, CH-1011 Lausanne, Switzerland. Blaise.genton@hospvd.ch

Travel Medicine and Infectious Disease
|November 14, 2006
PubMed
Summary

Hepatitis A vaccination in older adults may yield lower protection. A booster dose significantly increases seroprotection in those over 50, suggesting tailored vaccination strategies are needed for elderly travelers.

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Area of Science:

  • Immunology
  • Vaccinology
  • Public Health

Background:

  • Hepatitis A virus (HAV) infection poses significant risks to unprotected adults, especially the elderly.
  • Increasing international travel from low to high HAV endemicity areas necessitates pre-travel vaccination.
  • Age-related decline in immune response may reduce vaccine efficacy in older populations.

Purpose of the Study:

  • To evaluate the immune response and seroprotection rates of Hepatitis A vaccines in older adults.
  • To determine optimal vaccination strategies for elderly individuals traveling to HAV endemic regions.
  • To address the limited data on HAV vaccine immunogenicity in the elderly population.

Main Methods:

  • Review of prospective studies assessing monovalent and combined Hepatitis A vaccines in various age groups.

Related Experiment Videos

  • Analysis of seroprotection rates after primary and booster doses in subjects over 50 years old.
  • Comparison of immune responses between younger and older adult populations.

    • Main Results:

    • A single dose of monovalent HAV vaccine provided approximately 65% seroprotection in individuals over 50.
    • A booster dose increased seroprotection to 98% in the same age group.
    • Combined HAV/HBV vaccines showed high seroprotection (99-100%) in adults over 40 after three doses.

    Conclusions:

    • Elderly individuals may require booster doses or alternative vaccination schedules for optimal Hepatitis A protection.
    • Screening elderly travelers for natural immunity and timely vaccination are recommended.
    • Further research is needed to establish definitive optimal vaccination protocols for HAV in the elderly.