Objectives: There is currently no booster diphtheria or tetanus vaccine for Lao children before adolescence, despite international recommendations. We investigated seroprotection against diphtheria and tetanus among Lao adolescents.
Methods: Seven hundred seventy-nine serum samples were tested for anti-diphtheria and anti-tetanus antibodies.
Results: Overall, 25.8% of the adolescents had antibody titers corresponding to protection against diphtheria and 30.9% to sufficient immunity against tetanus. Female participants >16 years were more likely to be protected against diphtheria (p < 0.001) and tetanus (p < 0.029).
Conclusion: Low protection against diphtheria and tetanus, possibly due to low vaccination coverage or antibody waning, suggests booster doses are warranted before adolescence.
Keywords: Laos; diphtheria; seroprevalence; tetanus; vaccination.
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