“…Yet widespread prevalence of this public health problem persists in many developing countries, including some areas of Brazil (Gomes et al, 1975;Simmons and de Mello, 1975;Simmons, 1976;Olson, 1979;Roncada et al, 1981Roncada et al, , 1984Wilson et al, 1981; Santos et al, 1983a,b;Wilson and Nery, 1983; Araújo et al, 1984 Araújo et al, , 1986Dorea et al, 1984; Flores and Araújo, 1984;Favaro et al, 1986;Dricot-d'Ans et al, 1988; Gonçalves-Carvalho et al, 1995). Periodic administration of high-dose capsules of vitamin A and fortification of commonly consumed foods are considered short-term and medium-term measures, respectively.…”