Objective. The member states of the 41st World Health Assembly agreed to aim for the global eradication of polio by the year 2000. Turkey adopted this goal and made substantial progress. In this report, we present the results of a coverage and risk factor survey conducted to evaluate vaccine delivery during the 1999 national immunization days (NIDs) in a large district of Istanbul, Turkey. This study provides important information regarding risk factors and reasons for non-vaccination during the NIDs, defines rumours about the NIDs, and provides estimates of vaccination coverage.