Published in Vaccine Weekly, December 14th, 2005
According to a study from Spain, "To know the immune state against diphtheria through a survey, a consultation of the vaccination documents and a sero-epidemiologic study of an old population, the immunization status, and the prevalence of antidiphtheria antibodies were determined in a representative sample (n=231) of this population group (>65 years). Concentrations of toxin antibodies were measured using a commercial ELISA kit. Samples with titers >0.1 UI/mL were considered protective."
"In the vaccination documents we only found 19 old individuals vaccinated against...
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