Participants
MUMPS, RUBELLA, MEASLES
Caregivers of children were informed about the study when they presented for their 10, 11, and 12-month check-ups. Those who indicated interest were scheduled for their child’s 12-month vaccinations on one of the twice-weekly study days. Eligible children were aged 12–13 months, clinically healthy, and up to date on prior immunizations. Children with a prior history of MMR or YF vaccination, contraindications to MMR or YF vaccines, or a history of having measles, mumps, rubella, or YF disease were excluded. A parent or legal guardian provided written informed consent for their child’s participation.