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Diphtheria immunity in Flanders

C Matheï¹, P Van Damme, P Bruynseels

¹Department of Epidemiology and Community Medicine, University of Antwerp, Belgium.

European Journal of Clinical Microbiology & Infectious Diseases : Official Publication of the European Society of Clinical Microbiology

|November 14, 1997

Summary

A diphtheria immunity survey found 43% of Flemish adults are protected, but many remain susceptible. This highlights the critical need for adult booster immunizations to maintain public health.

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Area of Science:

Immunology
Public Health
Epidemiology

Background:

Diphtheria remains a public health concern globally.
Assessing population immunity is crucial for targeted vaccination strategies.
Previous diphtheria immunity data for the Flemish population is limited.

Purpose of the Study:

To determine the current level of diphtheria immunity in the Flemish population.
To identify age groups with inadequate diphtheria protection.
To inform public health policy regarding diphtheria booster immunizations.

Main Methods:

A serological survey was conducted on a representative sample of 1679 individuals from the Flemish population.
Serum diphtheria antitoxin concentrations were measured using a Vero cell culture toxin neutralization assay.

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The study included participants across all age groups from 0 to 100 years.

Main Results:

43% of the Flemish population demonstrated protective immunity against diphtheria (antitoxin titre ≥ 0.1 IU/ml).
32% of individuals were found to be susceptible (antitoxin titre < 0.01 IU/ml).
A significant age-related increase in susceptibility was observed, particularly in adults aged 35-54 years.

Conclusions:

A substantial portion of the Flemish population lacks adequate diphtheria immunity.
Adults, especially those aged 35-54, are at higher risk of diphtheria.
Booster immunization programs for adults are strongly recommended to enhance population-level protection against diphtheria.