Vol 5 No 2 Tahun 2021 (Oktober) ISSN 2580-3123 Jurnal Doppler Page 120 FAKTOR-FAKTOR YANG MEMPENGARUHI CAKUPAN IMUNISASI HB0 DI PUSKESMAS KOTA MEDAN TAHUN 2020 Rosmawaty Irma Suryani Siagian 1 , Ivan Elisabeth Purba 2 ,Rahmat Alyakin Dachi 3 , Donal Nababan 4 , Jasmen Manurung 5 1,2,3,4,5 Program Studi Magister Kesehatan Masyarakat Universitas Sari Mutiara Indonesia Email : nababandonal78@gmail.com ABSTRACT According to the World Health Organization (WHO) Hepatitis B is a world health problem that affects 257 million people worldwide. In 2015, an estimated 887,000 people died from complications of hepatitis B. Based on the results of the 2018 Basic Health Research (Riskesdas), the percentage who had received HB0 immunization in Indonesia was 83.1% (Riskesdas, 2018). Based on the results of the HB0 immunization coverage in Indonesia reported by Riskesdas 2018 above, it can be seen that the achievement of the HB0 immunization coverage target is still below the UCI urban village target set by the Indonesian Ministry of Health, which is at least 94.4% of the total number of babies (0-7 days). in these villages have received HB0 immunization (Kemenkes RI, 2015). The purpose of this study was to determine the factors that affect the coverage of HB0 immunization at the Medan City Health Center. This type of research is a quantitative analytic survey using a cross sectional study design. The population was all health workers who provided immunization services at the Medan City Health Center. The sampling technique used was purposive random sampling with a total of 55 respondents. The data used include primary data and secondary data. Data analysis used bivariate and multivariate approaches. The results of this study indicate that there is an effect of motivation on HB0 immunization coverage p = 0.030, there is an effect of supervision on HB0 immunization coverage p = 0.001, and there is an effect of length of service on HB0 immunization coverage p = 0.041. Supervision and work period are the most dominant variables with the equation value 0.884, The probability or prediction of the equation is 0.884 (> 0.05), in other words the variable of supervision and length of work affects the coverage of HB0 immunization at Medan City Health Center by 88.4%. It is recommended to the leadership to improve and improve the quality of supervision, and increase incentives, so that performance improvements are achieved, especially for immunization officers, so that later it will have an impact on increasing immunization coverage. Keywords: HB0 Immunization, Motivation, Supervision, Length of Working, Immunization Clerk PENDAHULUAN Penyakit Hepatitis B ini disebabkan oleh Virus Hepatitis B (VHB) yang menyerang hati dan menyebabkan peradangan hati akut atau menahun (penyakit hati kronis). Keadaan ini sangat berbahaya karena penderita merasa tidak sakit tetapi terus-menerus menularkan VHB kepada orang lain sehingga dapat terjadi wabah Hepatitis B dan juga mengalami komplikasi penyakit yaitu pengerasan hati yang disebut liver cirrhosis dan juga dapat berkembang menjadi kanker hati yang disebut dengan carcinoma hepatocelluler Menurut World Health Organization (WHO) Hepatitis B merupakan masalah