抄録
Malaria remains a major public health problem in most of the almost 100 countries or territories in which it is still endemic. It has been estimated that the number of new clinical cases is on the order of 100 million annually (WHO, 1987). While in many of the endemic countries the epidemiological situation has remained static, in others it has worsened and there have been a number of countries in which a serious recrudesence has occurred within the last few years, among them Sri Lanka and Brazil. There are many different reasons for this complex situation and some of them will be touched upon below, following a general review of the current epidemiological situation.
