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Anaissie and colleagues1 need to be congratulated on an impressive review of reported outbreaks of nosocomial illness linked to hospital water supplies. However, their conclusions about the burden of nosocomial disease due to water supplies are severely flawed. The authors' review exhibits several sources of bias that together would lead to substantial overestimation of disease burden.
Hunter PR. National Disease Burden Due to Waterborne Transmission of Nosocomial Pathogens Is Substantially Overestimated. Arch Intern Med. 2003;163(16):1974-1975. doi:10.1001/archinte.163.16.1974-a