Summary
In the months of May and June a parasitological investigation was made for 1035 residents of two areas of Manaus, Amazonas. The specimens were concentrated by Faust's method, and the authors prepared the followng index of intestinal parasites in these individuals. These results were obtained: Helminths: Trichocephalus trichiurus 74%, Ascaris lumbricoides 58%, Ancylostomideae 53%, Enterobius vermiculares 1%, Strongyloides stercoralis 9%, and Hymenolepis nana 0,3%. The highest incidence of protozoan parasites has of Giardia lamblia 17%, Endamoeba coli 14%, Endamoeba histolytica 3%, Iodamoeba butschlii 2.4% and Endolimax nana 0.7%.