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. 2010 Mar 23;4(3):e637. doi: 10.1371/journal.pntd.0000637

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Responses in car washers versus sand harvesters (A) and by age within each cohort (B). *p<0.05 for difference between mean cytokine concentration in men aged <25 years versus men ≥25 years.