A campaign has been launched to eradicate polio in West and Central Africa, targeting 85 million children. Some 400,000 health workers and volunteers will go from door-to-door in 19 countries, giving oral polio vaccine to children under the age of five. <br/><br/>The effort is a joint campaign by the Red Cross and United Nations. Previous efforts at eradication failed as too few children were vaccinated. <br/><br/>However, Africa has made significant progress in the fight against polio, which attacks the nervous system, but the virus has still not been stamped out.