[Results of simplified immunization schedules in the developing countries].

The results of studies on the immunization of people in developing countries with vaccines adsorbed on calcium phosphate are presented in this paper. Several programs which were studied with various organizations cooperating and which were intended to simplify vaccination campaigns brought us to the following conclusions: --that immunization against diphtheria and tetanus by two injections with an interval of one year between them is effective, --that two injections of inactivated trivalent poliomyelitis vaccine followed up by booster one year later ensure that 90% of the infants are protected, --that it is possible to vaccinate pregnant women by one or two injections of tetanus vaccine and protect both mothers and newborn babies against tetanus, and --that combined vaccines which enable simultaneous immunization of subjects against a maximum of infections are possible.