seroepidemiological study of p. vivax malaria with suspected long incubation in iran

p. vivax malaria with suspected long incubation have been frequently observed mostly in the northwest part of iran in the course of malaria control and malaria eradication operations. a sero-epidemiological study of such cases which present the first symptom in early spring, before anopheles activities season, was carried out in 92 selected villages with a population of 38,726 in two near areas in ramadan and bijar, in the west part pf iran. . the total number of 3553 blood samples for microscopical and indirect fluorescent antibody serological technique were collected in 12 weekly total surveillance in the- early months of the year 1973 and 1974. altogether seven cases parasitologically (p. vivax) and 98 cases serologically (titers 1/20 to 1/640) positive were observed. . from seven parasitological positive cases three were serologically negative. these three cases as they occurred at the beginning of appearance of anopheles.