ANTIBODY-RESPONSE TO MEASLES IMMUNIZATION IN RURAL GHANAIAN INFANTS

We investigated optimal age of measles immunization in infants aged 3- 11 months in rural villages of Ghana, and determined seroconversion ra te in the same infant population following further attenuated measles vaccination with Schwarz vaccine. The prevalence of passively acquired antibody was 11 per cent in infants younger than 6 months, 10 per cen t in infants 6 months old, and 3 per cent in infants 7 months old or o lder. Seroconversion rates in each age group were less than 50, 87, an d 92 per cent, respectively. We then immunized 47 7-month-old infants. The seroconversion rate was 92 per cent in this group. There were no clinical adverse effects due to the vaccination. We conclude that meas les vaccination could be administered effectively at the age of 7 mont hs with an excellent seroconversion rate.