Immunization: full coverage the aim.

In November 1988, nursing students at Khon Kaen University in northeast Thailand conducted a baseline survey in 16 villages before a retraining program for village health workers began. It consisted of a 1-week intensive training program and meetings between officers and village health workers. The goal was to achieve full immunization coverage for children under 5. After retraining, the workers implemented their health education and immunization recruitment programs with a refresher course 4 months later. The nursing students conducted a follow-up survey in June 1989 so researchers could compare the effects of the 8 intervention villages with data collected in the 8 control villages. The intervention indeed brought about improvement in immunization coverage, mother's and health worker's knowledge, and health worker participation in program planning and coordination in the case villages. For example, full immunization coverage among children under 1 increased from 65% to 89% while in the control villages it remained at 56%. It also increased among children over 5 (30-81%) but in the control villages it only rose slightly (23-31%). The percentage of mothers who were very knowledgeable about infectious diseases increased from 1% to 8% yet in the control villages it decreased from 2% to 0. Mothers with high level of knowledge about immunization was higher in the 2nd survey in both groups, but the increase was greater in the intervention villages (12-33% vs. 14-21%). High level of knowledge about infectious diseases among health workers grew considerably (3-72%) in the case villages but in the control villages it decreased from 10% to 2%. In addition, health workers in the case villages improved their contact with health officers but not those in the control villages (47-64% vs. 70-36%). Program participation increased in the intervention villages (11-36%) but fell in the control villages (22-13%).