Occupational diseases caused by biological agents (infectious and parasitic) Helminthiasis, duodenal hookworm, anguillulosia Underground work, tunnels, mines, galleries, mushroom caves, etc. Work in swampy areas, rice fields, salt flats. Malaria, amoebiasis, trypanosomiasis, dengue fever, papacytic fever, relapsing fever, yellow fever, plague, leishmaniasis, yaws, exanthematic typhus, and other ricketsioses. . Infectious or parasitic diseases transmitted to man by animals or their products and corpses (for tetanus, work with human or animal excreta will also be included).