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Immunogenicity and reactogenicity of DTPa and reduced antigen dTpa booster vaccines were compared to a hepatitis A control vaccine in DTPa-primed toddlers aged 18–20 months. Post-booster, all DTPa and dTpa recipients were seroprotected against diphtheria and tetanus, and ≥93.3% had a booster response to pertussis. There were similar reactogenicity rates in the DTPa and dTpa vaccine recipients. Few...
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