2003 United States hepatitis A outbreak
The 2003 United States hepatitis A outbreak was the most widespread hepatitis A outbreak in the United States. It afflicted at least 640 people, killing 4, in north-eastern Ohio and south-western Pennsylvania in late 2003. The outbreak was blamed on tainted green onions at a Chi-Chi's restaurant in Monaca, Pennsylvania.
- "Hepatitis A Outbreak Associated with Green Onions at a Restaurant – Monaca, Pennsylvania, 2003". Centers for Disease Control and Prevention. November 28, 2003. Retrieved 2011-10-08. "The Pennsylvania Department of Health and CDC are investigating an outbreak of hepatitis A outbreak among patrons of a restaurant (Restaurant A) at the Beaver Valley Mall in the Pittsburgh suburb of Monaca, Pennsylvania. As of November 20, approximately 555 persons with hepatitis A have been identified, including at least 13 Restaurant A food service workers and 75 residents of six other states who dined at Restaurant A. Three persons have died. Preliminary sequence analysis of a 340 nucleotide region of viral RNA obtained from three patrons who had hepatitis A indicated that all three virus sequences were identical. Preliminary analysis of a case-control study implicated green onions as the source of the outbreak. ..."