Address correspondence to Thomas Clasen, Disease Control and Vector Biology Unit, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK. E-mail:
Authors’ addresses: Thomas Clasen and Sophie Boisson, Disease Control and Vector Biology Unit, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK, Tel: 44-020-7927-2916, E-mails:
Acknowledgments: The authors thank the communities of Virar, Vasai, and Nalasopara for cooperation in connection with this study and to Wolf-Peter Schmidt and Lucy Smith of the London School of Hygiene and Tropical Medicine and for their assistance.
Financial support: This study was funded in part by Hindustan Unilever Limited (HUL). NN, RG, DD, and NS are employees of HUL. HUL manufactures and sells household-based water filters and could benefit from research showing that boiling is less effective or more costly than its products.
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