<p>A retrospective cross-sectional study was conducted employing qualitative and quantitative methodologies. A structured questionnaire was used to interview parents/caregivers on barriers to immunisation. Semi-structured interviews were conducted with two nurses and one pharmacist at each of the two identified health facilities and mobile clinics, and with two community healthcare workers (CHW) in each of the four municipalities. Quantitative and qualitative analyses of data were conducted.</p>