Synthetic-fibre filters for preventing dracunculiasis: 100 versus 200 micrometres pore size

Abstract
Filtering of drinking water to remove the copepod intermediate hosts of Dracunculus medinensis is a primary strategy for control of guinea-worm disease. Since filters of different porosities are used, we tested the efficiency of synthetic-fibre filters of 100 μm and 200 μm pore size in removing the various stages of 3 species of copepods from water samples. The 200 μm mesh retained the larger copepodid stages including adults (C III–VI), but permitted passage of smaller copepodids and all naupliar stages. The 100 μm mesh retained all but the earliest naupliar stages (N I–II) which are unlikely to harbour guinea-worm larvae.

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