The U.N. children’s agency says it is procuring nearly seven million doses of polio vaccine to inoculate children in Malawi. The action follows a confirmed polio case last month in Malawi’s capital, the first reported in Africa in five years and the first in Malawi in decades. Malawi had last reported a polio case in 1992. The country was declared polio-free in 2005 — 15 years before the African continent as a whole was declared polio-free. But health experts said the polio strain which paralyzed a three-year-old child last month is similar to one in Pakistan, and noted that the child was not fully vaccinated against polio. UNICEF said the planned mass immunization will target the unvaccinated as well as children previously vaccinated, so all can have full protection from the polio virus. Rudolf Schwenk, UNICEF’s representative in Malawi, said preparations are under way for the first …