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Since the introduction in 1998 of an adolescent pertussis vaccine booster (for persons aged 11-13 years) in France, the incidence of pertussis in adolescents and adults has been unknown. We therefore(More)
BACKGROUND The case-hospitalization ratio (CHR) is a key quantity for the management of emerging pathogens such as pandemic influenza. Yet, few running surveillance systems prospectively monitor the(More)