| 1969 |
Measles vaccine introduced in Bulgaria |
| 1969-1971 |
Catch-up campaigns, targeting all children 1 to 8 years of age without measles history |
| 1972 |
Measles immunization became universal in Bulgaria |
| 1972-1982 |
Routine immunization with one dose measles vaccine at 10 or more months of age |
| 1976 & 1981 |
Follow-up measles immunization campaigns for 2-14 years and 2-6 years old children regardless of their vaccination status |
| 1983 |
Universal Measles immunization with two doses measles vaccine |
| 1983-1985 |
Routine immunization with two doses measles vaccine
1st dose at 12 months of age
2nd dose at 4 age of age |
| 1986-1992 |
Routine immunization with two doses measles vaccine
1st dose at 12 months of age
2nd dose at 24 months of age |
| 1992 |
Follow-up measles immunization campaign for 12-14 years old children regardless of their vaccination status |
| 1993 |
Introduction of combined measles-mumps-rubella (MMR) vaccine into national vaccination schedule for the first dose at 13 months of age |
| 1993-2000 |
Routine immunization with two doses
1st dose (MMR) at 13 months of age
2nd dose (monovalent measles vaccine) at 12 years of age |
| 2000-2001 |
Introduction of MMR vaccine into national vaccination schedule for the second dose at 12 years of age. |
| Since 2001 |
Routine two dose immunization with MMR vaccine
1st dose MMR at 13 months of age
2nd dose MMR at 12 years of age |
| 1972 |
Monovalent Mumps vaccine introduced in Bulgaria |
| 1972-1975 |
Gradual coverage with one dose monovalent Mumps vaccine of all 1 – 12 yrs old children without mumps history |
| 1976-1981 |
Routine one dose immunization with monovalent Mumps vaccine for all children at 12 months of age |
| 1981 |
Mumps immunization campaign with monovalent Mumps vaccine, targeting 4-12 years old children |
| 1982-1986 |
Mumps immunization temporarily interrupted |
| 1986-1992 |
1986-1987: Mumps immunization catch-up campaign with monovalent Mumps vaccine targeting all children up to 5 years of age without mumps history
1987-1992: Routine one dose immunization with monovalent Mumps vaccine for all children at =14 months of age |
| 1993 |
Introduction of combined measles-mumps-rubella (MMR) vaccine into national vaccination schedule for the first dose at 13 months of age |
| 1993-2000 |
One dose MMR at 13 months of age |
| Since 2001 |
Routine two dose immunization with MMR vaccine
1st dose MMR at 13 months of age
2nd dose MMR at 12 years of age |