"Introduction
… In this paper, we present findings from the 2007–2008 season of our cluster-randomized intervention trial of face masks and hand hygiene for preventing ILI [influenza-like illness] and laboratory-confirmed influenza.
Methods ...
Study design
… The 2007–2008 trial described here followed 1,178 young adults living within university residence halls during the influenza season and included a significantly larger number of clusters for randomization. Thirty-seven residence houses located in five residence halls were randomly assigned to either an intervention or a control group…
Discussion
… There were no substantial reductions in ILI or laboratory-confirmed influenza in the face mask only group compared to the control."
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