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Maternal pertussis and influenza immunization coverage and attitude of health care workers towards these recommendations in Flanders, Belgium
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Influence of maternal vaccination against diphtheria, tetanus, and pertussis on the avidity of infant antibody responses to a pertussis containing vaccine in Belgium
Pertussis vaccination during pregnancy in Belgium : follow-up of infants until 1 month after the fourth infant pertussis vaccination at 15 months of age