Measles control in a rural area in Zimbabwe.

In the rural district of Chimanimani in Zimbabwe, the Expanded Programme on Immunisation (EPI) which started in January 1982 has achieved measles coverage of between 50 and 80% in the 12-23 months age group, from 1984 to 1988, through 65 outreach centres, and 15 static health centres serving 93985 people in 119 villages. Facility based data as well as community based surveys have failed to show serious measles transmission in children under nine months of age, a common observation in high population density urban areas in Africa. Instead there has been a reduction in measles incidence and age distribution of measles has shifted to older children. The lowest measles incidence rate of 0.8 per 100 children occurred in the 0-5 months age group and the highest incidence rate of 4.0 per 100 children in the 48-59 months of age group. Only 7.9% of measles cases occurred in children under nine months of age. The high vaccination coverage rates were made possible by the post-independence government commitment, community involvement and dedicated staff. Our observations support the current one-dose 9 months minimum age measles vaccination policy for the low density rural areas in the developing countries.