Outbreak of Salmonella Stanley in Sweden associated with alfalfa sprouts, July-August 2007.

The Swedish Institute for Infectious Disease Control (SMI) and the Swedish Regional Centres for Communicable Disease Control recently completed the investigation of a nationwide outbreak with 51 cases of Salmonella Stanley infection. A matched case-control study (using telephone interviews) was performed that strongly indicated an association between consumption of alfalfa sprouts produced in Sweden and S. Stanley infection (OR 28.6, 95% CI 3.8-216.4).