Haemophilus influenzae serotype b conjugate vaccine failure in twelve countries with established national childhood immunization programmes von Ladhani, S., Slack, M.P.E., Ramsay, M.E., Heath, P.T., McIntyre, P.B., Diez-Domingo, J., Campos, J., Dagan, R., participants of the European Union Invasive Bacterial Infections Surveillance (EU-IBIS) Network

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