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Findings reported this month by Brown and Rushton1,2 may rekindle debate about the carcinogenicity of crystalline silica. They studied mortality among 2703 workers employed in silica sand quarries in the UK where over 3000 exposure measurements had been taken, and found no consistent association between the level of respirable silica and lung cancer. However, in an accompanying commentary,3 Steenland finds these negative results unsurprising, primarily because exposures in the UK cohort were quite low. He writes that in light of the prior evidence that silica is carcinogenic, one new study that fails to show excess risk at low exposures does not justify a delay in lowering the level of silica allowed in industry.
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Personal protective equipment can be essential for preventing infection among healthcare workers, but its effectiveness depends on correct use. Unfortunately, it seems that hospital workers may be uncertain about which type of protection to use, even during
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