Background: Recent trends in global vaccination coverage have shown increases with most countries reaching
90% DTP3 coverage in 2008, although pockets of undervaccination continue to persist in parts of sub-Saharan
Africa particularly in the urban slums. The objectives of this study were to determine the vaccination status of
children aged between 12-23 months living in two slums of Nairobi and to identify the risk factors associated with
incomplete vaccination. Methods: The study was carried out as part of a longitudinal Maternal and Child Health study undertaken in Korogocho and Viwandani slums of Nairobi. These slums host the Nairobi Urban Health and Demographic
Surveillance System (NUHDSS) run by the African Population and Health Research Centre (APHRC). All women from
the NUHDSS area who gave birth since September 2006 were enrolled in the project and administered a questionnaire which asked about the vaccination history of their children. For the purpose of this study, we used data from 1848 children aged 12-23 months who were expected to have received all the WHO-recommended vaccinations. The vaccination details were collected during the first visit about four months after birth with followup visits repeated thereafter at four month intervals. Full vaccination was defined as receiving all the basic childhood vaccinations by the end of 24 months of life, whereas up-to-date (UTD) vaccination referred to receipt of BCG, OPV 1-3, DTP 1-3, and measles vaccinations within the first 12 months of life. All vaccination data were obtained from vaccination cards which were sighted during the household visit as well as by recall from mothers. Multivariate models were used to identify the risk factors associated with incomplete vaccination.
Martin works under the Health Challenges and Systems research program. He is currently the Project Manager for the IN DEPTH Vaccination Project (IVP). He holds a Masters degree in Biostatistics (2005) and Applied statistics (2004) from University of...
Elizabeth is a Public Health Specialist and is currently heading a project on maternal, infant and young child nutrition (MIYCN), aimed at determining the effectiveness of a community-based intervention to promote optimal infant and young...