This is a Phase II-III, controlled, randomized and double blind for the evaluation of a double viral vaccine anti measles and rubella (MR), which is under the development at Instituto de Tecnologia em Imunobiologicos Bio-Manguinhos/Fiocruz, in Brazil, for use in human beings. 432 eligible volunteers (11-month-old infants), will be vaccinated and monitored for local and systemic adverse events and immunogenicity. The study will last 11 months in total.