Shigella in Berries: Denver's Guide to Outbreak Prevention

Shigella Outbreaks in Denver: What Happened

Denver has experienced multiple Shigella contamination incidents in berries over the past five years, primarily linked to imported produce from Mexico and Central America where water sanitation challenges exist. The FDA identified Shigella sonnei and Shigella flexneri in fresh raspberries and blackberries sold at retail chains and farmers markets across the metro area. Colorado Department of Public Health and Environment tracked illnesses through laboratory confirmation and epidemiological investigation, coordinating with local hospitals and healthcare providers to identify cases. These outbreaks typically resulted in 20–80 confirmed illnesses, with symptoms appearing 1–3 days after consumption. The DPHE issued public health advisories and worked with retailers to remove contaminated inventory from shelves.

How Denver Health Departments Respond to Berry Contamination

The Denver Public Health and Environment (DPHE) coordinates with the Colorado Department of Public Health and Environment (CDPHE) and FDA to detect, investigate, and contain Shigella outbreaks. When contamination is suspected, DPHE collects product samples, performs laboratory testing, and traces the supply chain backward to identify source farms and distributors. The agency issues health advisories to healthcare providers, alerts retail chains, and publicizes recalls through media and its official website. Colorado's food safety regulations require retailers to immediately remove recalled berries and issue point-of-sale notifications. DPHE also maintains a network with foodborne illness hotlines and disease surveillance systems to capture case reports and track outbreak progression in real time.

Protect Yourself: Consumer Safety Tips for Berries in Denver

Purchase berries from reputable retailers that maintain cold-chain integrity and transparent sourcing practices; when possible, ask produce staff about origin and supplier certifications. Wash all fresh berries under running water immediately before eating or preparing, even if the package says "pre-washed"—this reduces but does not eliminate pathogenic risk. Check the FDA Enforcement Reports and CDPHE Food Safety Alerts regularly for active recalls; subscribe to real-time food safety notifications via Panko Alerts to receive instant updates on Shigella contamination in your area. Avoid consuming berries from unknown sources, farmers markets without verified farm certifications, or products with damaged packaging. If you develop symptoms (diarrhea, fever, abdominal cramps) within three days of eating berries, seek medical care and report the illness to Denver Public Health at (303) 692-2700.

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