MRC1 and measles: The MMR (mumps, measles and rubella; being a manufacturer GlaxoSmithKline Biologicals, Belgium) vaccine has been offered to Brazilians since 1992, when it effectively replaced the monovalent measles vaccine7, but it is only since 2004 that it has been strongly and regularly recommended to infants turning one year old, followed by a second dose 3 months later8.