Follow-up study for measles maternal antibodies and seroconversion after measles vaccination.

Seventy-two children were included in this study which examined measles maternal antibodies in children at the ages of six and nine months. The seroconversion after the first measles vaccination at nine months and revaccination at fifteen months was also evaluated. Results of testing were negative in 33% of the children at six months and in 36% at nine months, indicating continued susceptibility to measles. No significant difference was found in the measles IgG level between six and nine months of age. After the initial vaccination at nine months of age, the seroconversion rate was 85%. After revaccination at fifteen months of age, the children showed a significant increase in their measles IgG levels.