ABSTRACT
From 1983 to 1986, the authors surveyed for intestinal parasites in four groups of people. In the first group of 474 elementary school children in Bangkok aged 6-15 years, parasites were found in31.2 percent of the specimens examined, the highest prevalence of helminthes being hookworm and Ascaris lumbricoides, i.e. 9.2 and 7.5 percent, respectively; in the second group of 202 monks in Bangkok aged 10-77 years, intestinal parasites were observed in 19.8 percent of the cases, the findings bring hookworm (20.8%) and Strongyloides stercoralis (14.6%); in the third group of 308 monks in Saraburi province aged 10-67 years, intestinal parasites were detected in 60.4 percent of the cases, the finding being hookworm (36.5%) and Opisthorchis viverrini (36.1%); and in the fourth group of 459 monks in Nakorn Pathom province aged 13-35 years, intestinal parasites were found in 53.6 percent of the cases, the finding being Opisthorchis viverrini (32.7%) and hookworm (28.1%) in the firsts group; and Blastocystis hominis (22.9%, 6.9% and 10.6%); Entamoeba coli (12.5%, 6.2% and 8.0%) in the second, third and fourth groups, respectively.