<a href="http://www.washingtonpost.com/wp-dyn/articles/A11347-2003Nov24.html">Raw Menace (washingtonpost.com)</a>: “Epidemiologists in Pennsylvania and three other states where recent scallion outbreaks occurred have ruled out restaurant workers as the cause of infection because in each case restaurant workers who got sick appeared to have contracted the virus at the same time as patrons. Officials speculate that the onions may have been contaminated before they were shipped, by workers or their children who defecated in the fields near where the produce was being harvested. Another possibility is that water used to wash the produce was tainted by sewage.”