Effectiveness of mass treatment with mebendazole in the control of soil transmitted helminths in Sri Lanka.

The efficacy of a single large dose of mebendazole was compared with the three-day multiple dose in mass treatment. The subjects were selected from among plantation workers of a tea estate in Kandy. The multiple dose regime showed consistently better egg reduction rates and cure rates when compared to the single large dose in subjects harbouring one or more soil-transmitted helminths.