The invention relates to a method for inducing protection against the 4 serotypes of dengue fever in a patient, comprising: (a) the administration of a monovalent vaccine comprising a vaccinal virus of a first serotype of dengue fever, and (b) the administration of a tetravalent vaccine comprising vaccinal viruses of the four serotypes of dengue fever, in which administration (b) is made between at least 30 days and not more than 12 months following the first administration (a).