1996 Outbreak of Salmonella Stanley Infections Linked to Consumption of Alfalfa Sprouts, Virginia

A physician who provided medical care at two Lexington, Virginia universities reported 14 laboratory confirmed cases of Salmonella Stanley infections among students at the two schools. The ten students at University A had eaten most of their meals at the university cafeteria. Alfalfa sprouts consumption appeared to be significant. The four students who attended University B had eaten at a local restaurant that routinely served sprouts. No interaction was known between the students at University A and B. The restaurant and University A had purchased the sprouts from the same local distributor. This distributor had purchased the sprouts from farms in Virginia and Ohio. Both farms had been using Australian seed since the spring of 1995 subsequent to an international outbreak of Salmonella Stanley that occurred in 1995. Centers for Disease Control records showed that the Ohio and Virginia farms had received outbreak-associated seed lots. During this investigation, all available sprouts and seeds collected for testing showed no laboratory evidence of Salmonella. The Salmonella Stanley isolated from the ill students matched the strain that had been implicated in the 1995 outbreak. Leftover seed seemed likely to be the cause of this outbreak. Salmonella is hardy and can survive on dry seed for extended periods of time.

Overview

Outbreak began:February 1996
Affected country:US
States/territories:VA
Pathogen:Salmonella Stanley
Vehicle(s):Sprouts
Location(s):Restaurant, University cafeteria
Molecular test results:Not reported

Health impact

Total ill:26
Number hospitalized:9

Sources & documents

Report / reference links