Comparison of techniques for the enumeration of human parasitic helminth eggs in treated wastewater

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Abstract
Four methods for the enumeration of human parasitic nematodes in treated wastewater were compared in field trials in the northeast of Brazil. Effluents from a series of waste stabilisation ponds and a physico‐chemical lime treatment plant were used. Comparisons were made on a daily and 24 hour basis. The recovery of eggs was found to be consistently higher using the method currently recommended by the World Health organisation (1) (commonly known as the Bailenger method) but only when 10 1 samples, rather than 11 samples, were processed.