[1: WHO, Immunization Coverage, Fact Sheet 2018, http://www.who.int/mediacentre/factsheets/fs378/en/][2: Rappuoli R (2014), DG Research New Horizon for Vaccine Conference, https://ec.europa.eu/research/health/pdf/event17/s2-2-rino-rappuoli_en.pdf]
[1: Immunization Coverage (Cobertura Vacinal), OMS, Ficha Informativa, 2018, http://www.who.int/mediacentre/factsheets/fs378/en/][2: Rappuoli, Rino, DG Research New Horizon for Vaccine Conference (Conferência da DG Investigação, Novos Horizontes para a Vacinação), 2014,https://ec.europa.eu/research/health/pdf/event17/s2-2-rino-rappuoli_en.pdf]