| significance of circumsporozoite-specific antibody in the natural transmission of plasmodium falciparum, plasmodium vivax, and plasmodium malariae in an aboriginal (orang asli) population of central peninsula malaysia. | two hundred and seventy-five orang asli volunteers living in nine villages in the pos legap valley of perak state, peninsular malaysia, participated in a prospective study designed to characterize the epidemiological, parasitological, and entomological characteristics of plasmodium falciparum, p. vivax, and p. malariae malaria transmission. prevalence rates for the three plasmodial species at initiation of the study ranged from 56% in the 0-4-year-old age group to 0% in individuals over the age ... | 1991 | 1867348 |