Optimization of Officers' Role Defaulter Tracking to the Amount of Basic Immunization Coverage (Left Out and Drop Out) Babies Age 0-11 Months in the Working Area of the Pulau Beringin Puskesmas UPT, South Oku District

—Immunization is the most effective and efficient public health effort in preventing several infectious diseases. Low immunization coverage has the potential to cause extraordinary events of diseases that can be prevented by immunization (PD3I outbreak). Special strategies are needed to minimize the number of children who have not been immunized (Left out) and incomplete immunization (Drop out) by finding children who have not received immunization services or have not received immunizations according to schedule. Several strategies that have been proven to have an influence on parents' interest in providing immunizations to babies are sweeping (sweeping door to door) and counseling.. This research aims to determine the effect of optimizing the role of officers defaulter tracking on the number of basic immunization coverage (left out And drop out) babies aged 0-11 months in the working area of the Beringin Island Health Center UPT, South Ogan Komering Ulu Regency. The research design used was the Quasi Experimental method. By design one group pre test And post-test. The sample size is the total population of 60 mothers. The statistical test used is test Wilcoxon. Based on research, there is a significant influence on knowledge before and after counseling using leaflet media as well as behavior before and after sweeping door to door by officers defaulter tracking on the number of basic immunization coverage (LO and DO) in babies aged 0-11 months in the working area of the Beringin Island Health Center UPT, South Ogan Komering Ulu Regency with p-value 0,000. The conclusion of this research is that there is an influence of knowledge before and after counseling using leaflet media and there is an influence of behavior before and after sweeping door to door on basic immunization coverage (left out And drop out) in babies aged 0-11 months in the working area of the Beringin Island Health Center UPT, South Ogan Komering Ulu Regency.