[Survival of helminth eggs in the wastewater mud in the sludge beds of Chita waterworks].

The species composition, size, and survival of human and domestic animal helminth eggs was determined in the wastewater mud in the sludge beds of the waterworks of Chita. It was shown that when the wastewater mud was little dried in the sludge beds under distinctly continental climatic conditions for three years, their complete disinvasion did not take place. The eggs of seat-worms (Enterobius vermicularis), whipworms (Trichuris trichiura), broad tapeworms (Diphylobotrium latum), and teniae were undetectable in the mud samples after the second and third year of drying. Surviving Ascaris eggs may develop in the soil to the invasion stage under the climatic conditions of Chita, by creating a risk for new infections.