ProQuad
Measles–mumps–rubella–varicella vaccine (MMRV) · Merck Sharp & Dohme (MSD)
Prevents
Dosing schedules
Children aged 9–12 months during an outbreak: 2 doses at least 3 months apart
For: Infants (0–1 year)
| Dose | Age | Minimum interval from previous dose |
|---|---|---|
| Dose 1 (ProQuad) | 9–12 months, during a measles outbreak or when an outbreak is likely | – |
| Dose 2 (ProQuad) | At least 3 months after dose 1 | 90 days |
Source: Recommended vaccination schedules for all ages in Vietnam (2026 edition). Reviewed on 07/10/2026.
From 12 months: 2 doses
For: Young children (1–3 years)
| Dose | Age | Minimum interval from previous dose |
|---|---|---|
| Dose 1 (ProQuad) | 12 months | – |
| Dose 2 (ProQuad) | At least 1 month after dose 1, preferably within 3 months | 28 days |
Can be used as the second dose for children who have already had measles, mumps, rubella and varicella vaccines.
Source: Recommended vaccination schedules for all ages in Vietnam (2026 edition). Reviewed on 07/10/2026.
Special precautions
From 12 months: 2 doses at least 1 month apart (preferably within 3 months). Children aged 9–12 months can be vaccinated during an outbreak, with the second dose at least 3 months later.