[An immunisation coverage survey in the Kouilou area of Congo-Brazzaville].

An internal review of the expanded program of immunisation undertaken on the basis of daily data collected over the past five years from 1993 to 1997 in the region of Kouilou revealed a weak coverage level for all the antigens, associated with a strong dropout rate. In August 1999, a vaccination coverage survey was carried out on three strata of the Kouilou area in order to determine the proportion of children vaccinated by antigens. The method used is that of sampling clusters.